diff --git a/.gitignore b/.gitignore
index 22c2334..4606504 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ composer.lock
 .idea/
 .php_cs.cache
 .vscode/settings.json
+.phpunit.result.cache
diff --git a/activitypub.php b/activitypub.php
index 58d978a..bc895ef 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -19,7 +19,7 @@ namespace Activitypub;
  * Initialize plugin
  */
 function init() {
-	\defined( 'ACTIVITYPUB_HASHTAGS_REGEXP' ) || \define( 'ACTIVITYPUB_HASHTAGS_REGEXP', '(?:(?<=\s)|^)#(\w*[A-Za-z_]+\w*)' );
+	\defined( 'ACTIVITYPUB_HASHTAGS_REGEXP' ) || \define( 'ACTIVITYPUB_HASHTAGS_REGEXP', '(?:(?<=\s)|(?<=<p>)|(?<=<br>)|^)#([A-Za-z0-9_]+)(?:(?=\s|[[:punct:]]|$))' );
 	\defined( 'ACTIVITYPUB_ALLOWED_HTML' ) || \define( 'ACTIVITYPUB_ALLOWED_HTML', '<strong><a><p><ul><ol><li><code><blockquote><pre><img>' );
 	\defined( 'ACTIVITYPUB_CUSTOM_POST_CONTENT' ) || \define( 'ACTIVITYPUB_CUSTOM_POST_CONTENT', "<p><strong>%title%</strong></p>\n\n%content%\n\n<p>%hashtags%</p>\n\n<p>%shortlink%</p>" );
 	\define( 'ACTIVITYPUB_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
@@ -136,3 +136,11 @@ function enable_buddypress_features() {
 	\Activitypub\Integration\Buddypress::init();
 }
 add_action( 'bp_include', '\Activitypub\enable_buddypress_features' );
+
+add_action(
+	'friends_load_parsers',
+	function( \Friends\Feed $friends_feed ) {
+		require_once __DIR__ . '/integration/class-friends-feed-parser-activitypub.php';
+		$friends_feed->register_parser( Friends_Feed_Parser_ActivityPub::SLUG, new Friends_Feed_Parser_ActivityPub( $friends_feed ) );
+	}
+);
diff --git a/includes/class-health-check.php b/includes/class-health-check.php
index cb0e130..6d88eef 100644
--- a/includes/class-health-check.php
+++ b/includes/class-health-check.php
@@ -1,6 +1,8 @@
 <?php
 namespace Activitypub;
 
+use Activitypub\Rest\Webfinger;
+
 /**
  * ActivityPub Health_Check Class
  *
@@ -199,58 +201,37 @@ class Health_Check {
 	 * @return boolean|WP_Error
 	 */
 	public static function is_webfinger_endpoint_accessible() {
-		$user      = \wp_get_current_user();
-		$webfinger = \Activitypub\get_webfinger_resource( $user->ID );
+		$user    = \wp_get_current_user();
+		$account = \Activitypub\get_webfinger_resource( $user->ID );
 
-		$url = \wp_parse_url( \home_url(), \PHP_URL_SCHEME ) . '://' . \wp_parse_url( \home_url(), \PHP_URL_HOST );
-
-		if ( \wp_parse_url( \home_url(), \PHP_URL_PORT ) ) {
-			$url .= ':' . \wp_parse_url( \home_url(), \PHP_URL_PORT );
-		}
-
-		$url = \trailingslashit( $url ) . '.well-known/webfinger';
-
-		$url = \add_query_arg( 'resource', 'acct:' . $webfinger, $url );
-
-		// try to access author URL
-		$response = \wp_remote_get(
-			$url,
-			array(
-				'headers' => array( 'Accept' => 'application/activity+json' ),
-				'redirection' => 0,
-			)
-		);
-
-		if ( \is_wp_error( $response ) ) {
-			return new \WP_Error(
-				'webfinger_url_not_accessible',
-				\sprintf(
+		$url = Webfinger::resolve( $account );
+		if ( \is_wp_error( $url ) ) {
+			$health_messages = array(
+				'webfinger_url_not_accessible' => \sprintf(
 					// translators: %s: Author URL
 					\__(
 						'<p>Your WebFinger endpoint <code>%s</code> is not accessible. Please check your WordPress setup or permalink structure.</p>',
 						'activitypub'
 					),
-					$url
-				)
-			);
-		}
-
-		$response_code = \wp_remote_retrieve_response_code( $response );
-
-		// check if response is JSON
-		$body = \wp_remote_retrieve_body( $response );
-
-		if ( ! \is_string( $body ) || ! \is_array( \json_decode( $body, true ) ) ) {
-			return new \WP_Error(
-				'webfinger_url_not_accessible',
-				\sprintf(
+					$url->get_error_data()
+				),
+				'webfinger_url_invalid_response' => \sprintf(
 					// translators: %s: Author URL
 					\__(
 						'<p>Your WebFinger endpoint <code>%s</code> does not return valid JSON for <code>application/jrd+json</code>.</p>',
 						'activitypub'
 					),
-					$url
-				)
+					$url->get_error_data()
+				),
+			);
+			$message = null;
+			if ( isset( $health_messages[ $url->get_error_code() ] ) ) {
+				$message = $health_messages[ $url->get_error_code() ];
+			}
+			return new \WP_Error(
+				$url->get_error_code(),
+				$message,
+				$url->get_error_data()
 			);
 		}
 
diff --git a/includes/class-signature.php b/includes/class-signature.php
index 5caf884..f78b87d 100644
--- a/includes/class-signature.php
+++ b/includes/class-signature.php
@@ -70,7 +70,7 @@ class Signature {
 		\update_user_meta( $user_id, 'magic_sig_public_key', $detail['key'] );
 	}
 
-	public static function generate_signature( $user_id, $url, $date, $digest = null ) {
+	public static function generate_signature( $user_id, $http_method, $url, $date, $digest = null ) {
 		$key = self::get_private_key( $user_id );
 
 		$url_parts = \wp_parse_url( $url );
@@ -89,9 +89,9 @@ class Signature {
 		}
 
 		if ( ! empty( $digest ) ) {
-			$signed_string = "(request-target): post $path\nhost: $host\ndate: $date\ndigest: SHA-256=$digest";
+			$signed_string = "(request-target): $http_method $path\nhost: $host\ndate: $date\ndigest: SHA-256=$digest";
 		} else {
-			$signed_string = "(request-target): post $path\nhost: $host\ndate: $date";
+			$signed_string = "(request-target): $http_method $path\nhost: $host\ndate: $date";
 		}
 
 		$signature = null;
diff --git a/includes/functions.php b/includes/functions.php
index 2838941..1b86891 100644
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -35,7 +35,7 @@ function get_context() {
 function safe_remote_post( $url, $body, $user_id ) {
 	$date = \gmdate( 'D, d M Y H:i:s T' );
 	$digest = \Activitypub\Signature::generate_digest( $body );
-	$signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date, $digest );
+	$signature = \Activitypub\Signature::generate_signature( $user_id, 'post', $url, $date, $digest );
 
 	$wp_version = \get_bloginfo( 'version' );
 	$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
@@ -63,7 +63,7 @@ function safe_remote_post( $url, $body, $user_id ) {
 
 function safe_remote_get( $url, $user_id ) {
 	$date = \gmdate( 'D, d M Y H:i:s T' );
-	$signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date );
+	$signature = \Activitypub\Signature::generate_signature( $user_id, 'get', $url, $date );
 
 	$wp_version = \get_bloginfo( 'version' );
 	$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
@@ -101,11 +101,23 @@ function get_webfinger_resource( $user_id ) {
 /**
  * [get_metadata_by_actor description]
  *
- * @param sting $actor
+ * @param string $actor
  *
  * @return array
  */
 function get_remote_metadata_by_actor( $actor ) {
+	$pre = apply_filters( 'pre_get_remote_metadata_by_actor', false, $actor );
+	if ( $pre ) {
+		return $pre;
+	}
+	if ( preg_match( '/^@?[^@]+@((?:[a-z0-9-]+\.)+[a-z]+)$/i', $actor ) ) {
+		$actor = Rest\Webfinger::resolve( $actor );
+	}
+
+	if ( ! $actor ) {
+		return null;
+	}
+
 	$metadata = \get_transient( 'activitypub_' . $actor );
 
 	if ( $metadata ) {
diff --git a/includes/model/class-activity.php b/includes/model/class-activity.php
index eb96d11..9de1031 100644
--- a/includes/model/class-activity.php
+++ b/includes/model/class-activity.php
@@ -75,7 +75,7 @@ class Activity {
 	}
 
 	public function to_array() {
-		$array = \get_object_vars( $this );
+		$array = array_filter( \get_object_vars( $this ) );
 
 		if ( $this->context ) {
 			$array = array( '@context' => $this->context ) + $array;
diff --git a/includes/rest/class-inbox.php b/includes/rest/class-inbox.php
index 1ffe451..3408950 100644
--- a/includes/rest/class-inbox.php
+++ b/includes/rest/class-inbox.php
@@ -161,7 +161,6 @@ class Inbox {
 	public static function shared_inbox_post( $request ) {
 		$data = $request->get_params();
 		$type = $request->get_param( 'type' );
-
 		$users = self::extract_recipients( $data );
 
 		if ( ! $users ) {
@@ -407,6 +406,10 @@ class Inbox {
 	public static function handle_create( $object, $user_id ) {
 		$meta = \Activitypub\get_remote_metadata_by_actor( $object['actor'] );
 
+		if ( ! isset( $object['object']['inReplyTo'] ) ) {
+			return;
+		}
+
 		$comment_post_id = \url_to_postid( $object['object']['inReplyTo'] );
 
 		// save only replys and reactions
diff --git a/includes/rest/class-outbox.php b/includes/rest/class-outbox.php
index 55bb523..ad38f8d 100644
--- a/includes/rest/class-outbox.php
+++ b/includes/rest/class-outbox.php
@@ -43,6 +43,7 @@ class Outbox {
 	public static function user_outbox_get( $request ) {
 		$user_id = $request->get_param( 'user_id' );
 		$author  = \get_user_by( 'ID', $user_id );
+		$post_types = \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) );
 
 		if ( ! $author ) {
 			return new \WP_Error(
@@ -73,8 +74,11 @@ class Outbox {
 		$json->type = 'OrderedCollectionPage';
 		$json->partOf = \get_rest_url( null, "/activitypub/1.0/users/$user_id/outbox" ); // phpcs:ignore
 
-		$count_posts = \wp_count_posts();
-		$json->totalItems = \intval( $count_posts->publish ); // phpcs:ignore
+		$json->totalItems = 0;
+		foreach ( $post_types as $post_type ) {
+			$count_posts = \wp_count_posts( $post_type );
+			$json->totalItems += \intval( $count_posts->publish ); // phpcs:ignore
+		}
 
 		$json->first = \add_query_arg( 'page', 1, $json->partOf ); // phpcs:ignore
 		$json->last  = \add_query_arg( 'page', \ceil ( $json->totalItems / 10 ), $json->partOf ); // phpcs:ignore
@@ -89,7 +93,7 @@ class Outbox {
 					'posts_per_page' => 10,
 					'author' => $user_id,
 					'offset' => ( $page - 1 ) * 10,
-					'post_type' => 'post',
+					'post_type' => $post_types,
 				)
 			);
 
diff --git a/includes/rest/class-webfinger.php b/includes/rest/class-webfinger.php
index 60eb5d2..1b00d86 100644
--- a/includes/rest/class-webfinger.php
+++ b/includes/rest/class-webfinger.php
@@ -120,4 +120,44 @@ class Webfinger {
 
 		return $array;
 	}
+
+	public static function resolve( $account ) {
+		if ( ! preg_match( '/^@?[^@]+@((?:[a-z0-9-]+\.)+[a-z]+)$/i', $account, $m ) ) {
+			return null;
+		}
+		$url = \add_query_arg( 'resource', 'acct:' . ltrim( $account, '@' ), 'https://' . $m[1] . '/.well-known/webfinger' );
+		if ( ! \wp_http_validate_url( $url ) ) {
+			return new \WP_Error( 'invalid_webfinger_url', null, $url );
+		}
+
+		// try to access author URL
+		$response = \wp_remote_get(
+			$url,
+			array(
+				'headers' => array( 'Accept' => 'application/activity+json' ),
+				'redirection' => 0,
+			)
+		);
+
+		if ( \is_wp_error( $response ) ) {
+			return new \WP_Error( 'webfinger_url_not_accessible', null, $url );
+		}
+
+		$response_code = \wp_remote_retrieve_response_code( $response );
+
+		$body = \wp_remote_retrieve_body( $response );
+		$body = \json_decode( $body, true );
+
+		if ( ! isset( $body['links'] ) ) {
+			return new \WP_Error( 'webfinger_url_invalid_response', null, $url );
+		}
+
+		foreach ( $body['links'] as $link ) {
+			if ( 'self' === $link['rel'] && 'application/activity+json' === $link['type'] ) {
+				return $link['href'];
+			}
+		}
+
+		return new \WP_Error( 'webfinger_url_no_activity_pub', null, $body );
+	}
 }
diff --git a/integration/class-friends-feed-parser-activitypub.php b/integration/class-friends-feed-parser-activitypub.php
new file mode 100644
index 0000000..db155c1
--- /dev/null
+++ b/integration/class-friends-feed-parser-activitypub.php
@@ -0,0 +1,409 @@
+<?php
+/**
+ * This is the class for integrating ActivityPub into the Friends Plugin.
+ *
+ * @since 0.14
+ *
+ * @package ActivityPub
+ * @author Alex Kirk
+ */
+namespace Activitypub;
+
+class Friends_Feed_Parser_ActivityPub extends \Friends\Feed_Parser {
+	const SLUG = 'activitypub';
+	const NAME = 'ActivityPub';
+	const URL = 'https://www.w3.org/TR/activitypub/';
+	private $friends_feed;
+
+	/**
+	 * Constructor.
+	 *
+	 * @param      \Friends\Feed  $friends_feed  The friends feed
+	 */
+	public function __construct( \Friends\Feed $friends_feed ) {
+		$this->friends_feed = $friends_feed;
+
+		\add_action( 'activitypub_inbox', array( $this, 'handle_received_activity' ), 10, 3 );
+		\add_action( 'friends_user_feed_activated', array( $this, 'queue_follow_user' ), 10 );
+		\add_action( 'friends_user_feed_deactivated', array( $this, 'queue_unfollow_user' ), 10 );
+		\add_action( 'friends_feed_parser_activitypub_follow', array( $this, 'follow_user' ), 10, 2 );
+		\add_action( 'friends_feed_parser_activitypub_unfollow', array( $this, 'unfollow_user' ), 10, 2 );
+		\add_filter( 'friends_rewrite_incoming_url', array( $this, 'friends_rewrite_incoming_url' ), 10, 2 );
+	}
+
+	/**
+	 * Allow logging a message via an action.
+	 * @param string $message The message to log.
+	 * @param array $objects Optional objects as meta data.
+	 * @return void
+	 */
+	private function log( $message, $objects = array() ) {
+		do_action( 'friends_activitypub_log', $message, $objects );
+	}
+
+	/**
+	 * Determines if this is a supported feed and to what degree we feel it's supported.
+	 *
+	 * @param      string      $url        The url.
+	 * @param      string      $mime_type  The mime type.
+	 * @param      string      $title      The title.
+	 * @param      string|null $content    The content, it can't be assumed that it's always available.
+	 *
+	 * @return     int  Return 0 if unsupported, a positive value representing the confidence for the feed, use 10 if you're reasonably confident.
+	 */
+	public function feed_support_confidence( $url, $mime_type, $title, $content = null ) {
+		if ( preg_match( '/^@?[^@]+@((?:[a-z0-9-]+\.)+[a-z]+)$/i', $url ) ) {
+			return 10;
+		}
+
+		return 0;
+	}
+
+	/**
+	 * Format the feed title and autoselect the posts feed.
+	 *
+	 * @param      array $feed_details  The feed details.
+	 *
+	 * @return     array  The (potentially) modified feed details.
+	 */
+	public function update_feed_details( $feed_details ) {
+		$meta = \Activitypub\get_remote_metadata_by_actor( $feed_details['url'] );
+		if ( ! $meta && is_wp_error( $meta ) ) {
+			return $meta;
+		}
+
+		if ( isset( $meta['name'] ) ) {
+			$feed_details['title'] = $meta['name'];
+		} elseif ( isset( $meta['preferredUsername'] ) ) {
+			$feed_details['title'] = $meta['preferredUsername'];
+		}
+
+		if ( isset( $meta['id'] ) ) {
+			$feed_details['url'] = $meta['id'];
+		}
+
+		return $feed_details;
+	}
+
+	/**
+	 * Rewrite a Mastodon style URL @username@server to a URL via webfinger.
+	 *
+	 * @param      string  $url           The URL to filter.
+	 * @param      string  $incoming_url  Potentially a mastodon identifier.
+	 *
+	 * @return     <type>  ( description_of_the_return_value )
+	 */
+	public function friends_rewrite_incoming_url( $url, $incoming_url ) {
+		if ( preg_match( '/^@?[^@]+@((?:[a-z0-9-]+\.)+[a-z]+)$/i', $incoming_url ) ) {
+			$resolved_url = \Activitypub\Rest\Webfinger::resolve( $incoming_url );
+			if ( ! is_wp_error( $resolved_url ) ) {
+				return $resolved_url;
+			}
+		}
+		return $url;
+	}
+
+	/**
+	 * Discover the feeds available at the URL specified.
+	 *
+	 * @param      string $content  The content for the URL is already provided here.
+	 * @param      string $url      The url to search.
+	 *
+	 * @return     array  A list of supported feeds at the URL.
+	 */
+	public function discover_available_feeds( $content, $url ) {
+		$discovered_feeds = array();
+
+		$meta = \Activitypub\get_remote_metadata_by_actor( $url );
+		if ( $meta && ! is_wp_error( $meta ) ) {
+			$discovered_feeds[ $meta['id'] ] = array(
+				'type'        => 'application/activity+json',
+				'rel'         => 'self',
+				'post-format' => 'status',
+				'parser'      => self::SLUG,
+				'autoselect'  => true,
+			);
+		}
+		return $discovered_feeds;
+	}
+
+	/**
+	 * Fetches a feed and returns the processed items.
+	 *
+	 * @param      string $url        The url.
+	 *
+	 * @return     array            An array of feed items.
+	 */
+	public function fetch_feed( $url ) {
+		// There is no feed to fetch, we'll receive items via ActivityPub.
+		return array();
+	}
+
+	/**
+	 * Handles "Create" requests
+	 *
+	 * @param  array $object  The activity-object
+	 * @param  int   $user_id The id of the local blog-user
+	 * @param string $type  The type of the activity.
+	 */
+	public function handle_received_activity( $object, $user_id, $type ) {
+		if ( ! in_array(
+			$type,
+			array(
+				// We don't need to handle 'Accept' types since it's handled by the ActivityPub plugin itself.
+				'create',
+				'announce',
+			),
+			true
+		) ) {
+			return false;
+		}
+		$actor_url = $object['actor'];
+		$user_feed = false;
+		if ( \wp_http_validate_url( $actor_url ) ) {
+			// Let's check if we follow this actor. If not it might be a different URL representation.
+			$user_feed = $this->friends_feed->get_user_feed_by_url( $actor_url );
+		}
+
+		if ( is_wp_error( $user_feed ) || ! \wp_http_validate_url( $actor_url ) ) {
+			$meta = \Activitypub\get_remote_metadata_by_actor( $actor_url );
+			if ( ! $meta || ! isset( $meta['url'] ) ) {
+				$this->log( 'Received invalid meta for ' . $actor_url );
+				return false;
+			}
+
+			$actor_url = $meta['url'];
+			if ( ! \wp_http_validate_url( $actor_url ) ) {
+				$this->log( 'Received invalid meta url for ' . $actor_url );
+				return false;
+			}
+		}
+
+		$user_feed = $this->friends_feed->get_user_feed_by_url( $actor_url );
+		if ( ! $user_feed || is_wp_error( $user_feed ) ) {
+			$this->log( 'We\'re not following ' . $actor_url );
+			// We're not following this user.
+			return false;
+		}
+
+		switch ( $type ) {
+			case 'create':
+				return $this->handle_incoming_post( $object['object'], $user_feed );
+			case 'announce':
+				return $this->handle_incoming_announce( $object['object'], $user_feed, $user_id );
+
+		}
+
+		return true;
+	}
+
+	/**
+	 * Map the Activity type to a post fomat.
+	 *
+	 * @param      string  $type   The type.
+	 *
+	 * @return     string  The determined post format.
+	 */
+	private function map_type_to_post_format( $type ) {
+		return 'status';
+	}
+
+	/**
+	 * We received a post for a feed, handle it.
+	 *
+	 * @param      array               $object     The object from ActivityPub.
+	 * @param      \Friends\User_Feed  $user_feed  The user feed.
+	 */
+	private function handle_incoming_post( $object, \Friends\User_Feed $user_feed ) {
+		$permalink = $object['id'];
+		if ( isset( $object['url'] ) ) {
+			$permalink = $object['url'];
+		}
+
+		$data = array(
+			'permalink' => $permalink,
+			'content' => $object['content'],
+			'post_format' => $this->map_type_to_post_format( $object['type'] ),
+			'date' => $object['published'],
+		);
+
+		if ( isset( $object['attributedTo'] ) ) {
+			$meta = \Activitypub\get_remote_metadata_by_actor( $object['attributedTo'] );
+			$this->log( 'Attributed to ' . $object['attributedTo'], compact( 'meta' ) );
+			if ( isset( $meta['name'] ) ) {
+				$data['author'] = $meta['name'];
+			} elseif ( isset( $meta['preferredUsername'] ) ) {
+				$data['author'] = $meta['preferredUsername'];
+			}
+		}
+
+		if ( ! empty( $object['attachment'] ) ) {
+			foreach ( $object['attachment'] as $attachment ) {
+				if ( ! isset( $attachment['type'] ) || ! isset( $attachment['mediaType'] ) ) {
+					continue;
+				}
+				if ( 'Document' !== $attachment['type'] || strpos( $attachment['mediaType'], 'image/' ) !== 0 ) {
+					continue;
+				}
+
+				$data['content'] .= PHP_EOL;
+				$data['content'] .= '<!-- wp:image -->';
+				$data['content'] .= '<p><img src="' . esc_url( $attachment['url'] ) . '" width="' . esc_attr( $attachment['width'] ) . '"  height="' . esc_attr( $attachment['height'] ) . '" class="size-full" /></p>';
+				$data['content'] .= '<!-- /wp:image  -->';
+			}
+			$meta = \Activitypub\get_remote_metadata_by_actor( $object['attributedTo'] );
+			$this->log( 'Attributed to ' . $object['attributedTo'], compact( 'meta' ) );
+			if ( isset( $meta['name'] ) ) {
+				$data['author'] = $meta['name'];
+			} elseif ( isset( $meta['preferredUsername'] ) ) {
+				$data['author'] = $meta['preferredUsername'];
+			}
+		}
+
+		$this->log(
+			'Received feed item',
+			array(
+				'url' => $permalink,
+				'data' => $data,
+			)
+		);
+		$item = new \Friends\Feed_Item( $data );
+
+		$this->friends_feed->process_incoming_feed_items( array( $item ), $user_feed );
+
+		return true;
+	}
+
+	/**
+	 * We received an announced URL (boost) for a feed, handle it.
+	 *
+	 * @param      array               $url     The announced URL.
+	 * @param      \Friends\User_Feed  $user_feed  The user feed.
+	 */
+	private function handle_incoming_announce( $url, \Friends\User_Feed $user_feed, $user_id ) {
+		if ( ! \wp_http_validate_url( $url ) ) {
+			$this->log( 'Received invalid announce', compact( 'url' ) );
+			return false;
+		}
+		$this->log( 'Received announce for ' . $url );
+
+		$response = \Activitypub\safe_remote_get( $url, $user_id );
+		if ( \is_wp_error( $response ) ) {
+			return $response;
+		}
+		$json = \wp_remote_retrieve_body( $response );
+		$object = \json_decode( $json, true );
+		if ( ! $object ) {
+			$this->log( 'Received invalid json', compact( 'json' ) );
+			return false;
+		}
+		$this->log( 'Received response', compact( 'url', 'object' ) );
+
+		return $this->handle_incoming_post( $object, $user_feed );
+	}
+
+	/**
+	 * Prepare to follow the user via a scheduled event.
+	 *
+	 * @param      \Friends\User_Feed  $user_feed  The user feed.
+	 *
+	 * @return     bool|WP_Error              Whether the event was queued.
+	 */
+	public function queue_follow_user( \Friends\User_Feed $user_feed ) {
+		if ( self::SLUG !== $user_feed->get_parser() ) {
+			return;
+		}
+
+		$args = array( $user_feed->get_url(), get_current_user_id() );
+
+		$unfollow_timestamp = wp_next_scheduled( 'friends_feed_parser_activitypub_unfollow', $args );
+		if ( $unfollow_timestamp ) {
+			// If we just unfollowed, we don't want the event to potentially be executed after our follow event.
+			wp_unschedule_event( $unfollow_timestamp, $args );
+		}
+
+		if ( wp_next_scheduled( 'friends_feed_parser_activitypub_follow', $args ) ) {
+			return;
+		}
+
+		return \wp_schedule_single_event( \time(), 'friends_feed_parser_activitypub_follow', $args );
+	}
+
+	/**
+	 * Follow a user via ActivityPub at a URL.
+	 *
+	 * @param      string  $url    The url.
+	 * @param      int  $user_id   The current user id.
+	 */
+	public function follow_user( $url, $user_id ) {
+		$meta = \Activitypub\get_remote_metadata_by_actor( $url );
+		$to = $meta['id'];
+		$inbox = \Activitypub\get_inbox_by_actor( $to );
+		$actor = \get_author_posts_url( $user_id );
+
+		$activity = new \Activitypub\Model\Activity( 'Follow', \Activitypub\Model\Activity::TYPE_SIMPLE );
+		$activity->set_to( null );
+		$activity->set_cc( null );
+		$activity->set_actor( $actor );
+		$activity->set_object( $to );
+		$activity->set_id( $actor . '#follow-' . \preg_replace( '~^https?://~', '', $to ) );
+		$activity = $activity->to_json();
+		\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
+	}
+
+	/**
+	 * Prepare to unfollow the user via a scheduled event.
+	 *
+	 * @param      \Friends\User_Feed  $user_feed  The user feed.
+	 *
+	 * @return     bool|WP_Error              Whether the event was queued.
+	 */
+	public function queue_unfollow_user( \Friends\User_Feed $user_feed ) {
+		if ( self::SLUG !== $user_feed->get_parser() ) {
+			return false;
+		}
+
+		$args = array( $user_feed->get_url(), get_current_user_id() );
+
+		$follow_timestamp = wp_next_scheduled( 'friends_feed_parser_activitypub_follow', $args );
+		if ( $follow_timestamp ) {
+			// If we just followed, we don't want the event to potentially be executed after our unfollow event.
+			wp_unschedule_event( $follow_timestamp, $args );
+		}
+
+		if ( wp_next_scheduled( 'friends_feed_parser_activitypub_unfollow', $args ) ) {
+			return true;
+		}
+
+		return \wp_schedule_single_event( \time(), 'friends_feed_parser_activitypub_unfollow', $args );
+	}
+
+	/**
+	 * Unfllow a user via ActivityPub at a URL.
+	 *
+	 * @param      string  $url    The url.
+	 * @param      int  $user_id   The current user id.
+	 */
+	public function unfollow_user( $url, $user_id ) {
+		$meta = \Activitypub\get_remote_metadata_by_actor( $url );
+		$to = $meta['id'];
+		$inbox = \Activitypub\get_inbox_by_actor( $to );
+		$actor = \get_author_posts_url( $user_id );
+
+		$activity = new \Activitypub\Model\Activity( 'Undo', \Activitypub\Model\Activity::TYPE_SIMPLE );
+		$activity->set_to( null );
+		$activity->set_cc( null );
+		$activity->set_actor( $actor );
+		$activity->set_object(
+			array(
+				'type' => 'Follow',
+				'actor' => $actor,
+				'object' => $to,
+				'id' => $to,
+			)
+		);
+		$activity->set_id( $actor . '#unfollow-' . \preg_replace( '~^https?://~', '', $to ) );
+		$activity = $activity->to_json();
+		\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
+	}
+}
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 9acf920..3867ab2 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -19,6 +19,12 @@ require_once $_tests_dir . '/includes/functions.php';
  */
 function _manually_load_plugin() {
 	require \dirname( \dirname( __FILE__ ) ) . '/activitypub.php';
+
+	// Load the Friends plugin if available to test the integrations.
+	$friends_plugin = \dirname( \dirname( \dirname( __FILE__ ) ) ) . '/friends/friends.php';
+	if ( file_exists( $friends_plugin ) ) {
+		require $friends_plugin;
+	}
 }
 \tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );
 
diff --git a/tests/fixtures/notiz-blog-2022-11-14-the-at-protocol.response b/tests/fixtures/notiz-blog-2022-11-14-the-at-protocol.response
new file mode 100644
index 0000000..d6705a1
--- /dev/null
+++ b/tests/fixtures/notiz-blog-2022-11-14-the-at-protocol.response
@@ -0,0 +1 @@
+a:3:{s:7:"headers";a:15:{s:4:"date";s:29:"Fri, 02 Dec 2022 12:09:11 GMT";s:12:"content-type";s:25:"application/activity+json";s:6:"server";s:5:"nginx";s:15:"x-xrds-location";s:24:"https://notiz.blog/?xrds";s:16:"x-yadis-location";s:24:"https://notiz.blog/?xrds";s:10:"x-pingback";s:29:"https://notiz.blog/xmlrpc.php";s:4:"link";s:541:"<https://notiz.blog/wp-api/micropub/1.0/media>; rel="micropub_media", <https://notiz.blog/wp-api/micropub/1.0/endpoint>; rel="micropub", <https://notiz.blog/wp-api/friends/v1>; rel="friends-base-url", <https://notiz.blog/wp-api/webmention/1.0/endpoint>; rel="webmention", <https://notiz.blog/wp-api/webmention/1.0/endpoint>; rel="http://webmention.org/", <https://notiz.blog/wp-api/>; rel="https://api.w.org/", <https://notiz.blog/wp-api/wp/v2/posts/22221>; rel="alternate"; type="application/json", <https://notiz.blog/b/6AM>; rel=shortlink";s:13:"cache-control";s:17:"max-age=0, public";s:7:"expires";s:29:"Fri, 02 Dec 2022 12:09:11 GMT";s:16:"x-xss-protection";s:13:"1; mode=block";s:22:"x-content-type-options";s:7:"nosniff";s:25:"strict-transport-security";s:16:"max-age=31536000";s:15:"x-frame-options";s:10:"SAMEORIGIN";s:15:"referrer-policy";s:31:"strict-origin-when-cross-origin";s:17:"x-clacks-overhead";s:19:"GNU Terry Pratchett";}s:4:"body";s:18048:"{"@context":["https:\/\/www.w3.org\/ns\/activitystreams","https:\/\/w3id.org\/security\/v1",{"manuallyApprovesFollowers":"as:manuallyApprovesFollowers","PropertyValue":"schema:PropertyValue","schema":"http:\/\/schema.org#","pt":"https:\/\/joinpeertube.org\/ns#","toot":"http:\/\/joinmastodon.org\/ns#","value":"schema:value","Hashtag":"as:Hashtag","featured":{"@id":"toot:featured","@type":"@id"},"featuredTags":{"@id":"toot:featuredTags","@type":"@id"}}],"id":"https:\/\/notiz.blog\/2022\/11\/14\/the-at-protocol\/","type":"Note","published":"2022-11-14T16:49:01Z","attributedTo":"https:\/\/notiz.blog\/author\/matthias-pfefferle\/","summary":null,"inReplyTo":null,"content":"\u003Cp\u003EVor zwei Jahren wollte Twitter in das \u201eDezentrale Netzwerke\u201c-Business einsteigen und gr\u00fcndete eigens daf\u00fcr das \u003Ca href=\u0022https:\/\/notiz.blog\/2019\/12\/13\/twitiverse\/\u0022 data-type=\u0022post\u0022 data-id=\u002218831\u0022\u003EProjekt Bluesky\u003C\/a\u003E. In den folgenden zwei Jahren wurde viel evaluiert und diskutiert, was wohl die beste L\u00f6sung f\u00fcr Twitter sei und wir alle \u003Cem\u003Efieberten\u003C\/em\u003E mit ob es nun \u003Ca href=\u0022https:\/\/www.w3.org\/TR\/activitypub\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/www.w3.org\/TR\/activitypub\/\u0022\u003EActivityPub\u003C\/a\u003E oder doch \u003Ca href=\u0022https:\/\/matrix.org\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/matrix.org\/\u0022\u003EMatrix\u003C\/a\u003E werden w\u00fcrde\u2026 \u003C\/p\u003E\u003Cp\u003EAber das Warten hat ein Ende! \u003Ca href=\u0022https:\/\/blueskyweb.xyz\/blog\/10-18-2022-the-at-protocol\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/blueskyweb.xyz\/blog\/10-18-2022-the-at-protocol\u0022\u003EBluesky hat verk\u00fcndet wie es weiter geht\u003C\/a\u003E!\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESie entwickeln ein neues Protokoll!\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDas \u003Cem\u003EAT Protocol\u003C\/em\u003E, kurz f\u00fcr \u003Cem\u003EAuthenticated Transfer Protocol\u003C\/em\u003E!\u003C\/p\u003E\u003Cp\u003EIch hab mir die \u003Ca href=\u0022https:\/\/atproto.com\/guides\/faq\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/atproto.com\/guides\/faq\u0022\u003EFAQ\u003C\/a\u003E mal angeschaut und dort steht warum Bluesky sich gegen ActivityPub entschieden hat:\u003C\/p\u003E\u003Cblockquote class=\u0022wp-block-quote\u0022\u003E\n\u003Cp\u003EAccount portability is the major reason why we chose to build a separate protocol. We consider portability to be crucial because it protects users from sudden bans, server shutdowns, and policy disagreements. Our solution for portability requires both \u003Ca href=\u0022https:\/\/atproto.com\/guides\/data-repos\u0022\u003Esigned data repositories\u003C\/a\u003E and \u003Ca href=\u0022https:\/\/atproto.com\/guides\/identity\u0022\u003EDIDs\u003C\/a\u003E, neither of which are easy to retrofit into ActivityPub. The migration tools for ActivityPub are comparatively limited; they require the original server to provide a redirect and cannot migrate the user\u2019s previous data.\u003C\/p\u003E\n\u003C\/blockquote\u003E\u003Cp\u003EDas erinnert mich ein bisschen an die Subline von meinem \u003Ca href=\u0022https:\/\/pfefferle.dev\/openwebicons\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/pfefferle.dev\/openwebicons\/\u0022\u003EOpenWeb-Icons Font\u003C\/a\u003E:\u003C\/p\u003E\u003Cblockquote class=\u0022wp-block-quote\u0022\u003E\n\u003Cp\u003EWhy \u003Cem\u003EOpenWeb Icons\u003C\/em\u003E? Because \u003Ca href=\u0022https:\/\/fortawesome.com\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/fortawesome.com\/\u0022\u003EFont Awesome\u003C\/a\u003E had no RSS-icon [\u2026]\u003C\/p\u003E\n\u003C\/blockquote\u003E\u003Cp\u003E\u003Cstrong\u003EWeil ActivityPub keine perfekte L\u00f6sung f\u00fcr \u201eAccount portability\u201c hat, bauen sie ein komplett neues Protokoll?\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EActivityPub ist sicherlich nicht \u201efeature complete\u201c, aber ein guter erster Wurf, was das Fediverse erfolgreich bewiesen hat! Warum arbeitet Twitter also lieber an einem eigen Format anstatt mit dem W3C zusammen an ActivityPub v2?\u003C\/p\u003E\u003Cp\u003EWarum macht sich das W3C \u00fcberhaupt noch die M\u00fche \u201eStandards\u201c zu definieren?\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EWegen der Interoperabilit\u00e4t!\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EW\u00fcrde Twitter mit HTTP(S), HTML oder CSS \u00e4hnlich umgehen, w\u00fcrde der Browser einfach leer bleiben, weil das \u0026$%\u00a7\u0026 Internet nur mit einheitlichen Standards funktioniert!\u003C\/p\u003E\u003Cp\u003EUnd das gleiche gilt auch f\u00fcr dezentralte Netze, zumindest wenn sie erfolgreich sein wollen! Dar\u00fcber hab ich tragischerweise schon vor \u003Cstrong\u003E10 Jahren\u003C\/strong\u003E geschrieben!\u003C\/p\u003E\u003Cblockquote class=\u0022wp-block-quote\u0022\u003E\n\u003Cp\u003EDiaspora* wurde kaum \u003Ca href=\u0022https:\/\/web.archive.org\/web\/20130630113539\/http:\/\/blog.diasporafoundation.org\/2012\/08\/27\/announcement-diaspora-will-now-be-a-community-project.html\u0022\u003Ef\u00fcr \u201etot\u201c erkl\u00e4rt\u003C\/a\u003E und schon steht das n\u00e4chste Projekt in den Startl\u00f6chern! \u003Ca href=\u0022https:\/\/web.archive.org\/web\/20190603031810\/https:\/\/tent.io\/\u0022\u003ETent.io\u003C\/a\u003E soll ein protocol for distributed social networking and personal data storage werden. Alles neu, alles anders, alles besser als OStatus, DiSo oder Diaspora*. Aber mal ganz ehrlich\u2026 was haben die Diasporas \u0026 Co. bisher geschaffen? Ziel war es Facebooks \u201eWalled Gardens\u201c aufzubrechen und was kam wirklich dabei rum? Eine ganze Reihe an dezentralen \u201eWalled Gardens\u201c. Na danke!\u003C\/p\u003E\n\u003Ccite\u003E\u003Ca href=\u0022https:\/\/notiz.blog\/2012\/11\/15\/dezentrale-walled-gardens\/\u0022\u003EDezentrale \u201eWalled Gardens\u201c\u003C\/a\u003E\u003C\/cite\u003E\u003C\/blockquote\u003E\u003Cp\u003EDas \u003Ca href=\u0022https:\/\/the-federation.info\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/the-federation.info\/\u0022\u003Efediverse\u003C\/a\u003E hat (wie schon erw\u00e4hnt) bisher einen gro\u00dfartigen Job gemacht und verschiedenste Netzwerke mit den verschiedensten Auspr\u00e4gungen vernetzt! Ich \u003Cs\u003Eglaube\u003C\/s\u003E bin der festen \u00dcberzeugung, dass sich diesmal wirklich das offene Format (\u003Cem\u003EActivityPub\u003C\/em\u003E) durchsetzen wird und Blueskys \u003Cem\u003EAuthenticated Transfer Protocol\u003C\/em\u003E auch in ein paar Monaten oder Jahren keine Rolle spielen wird! \u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/twitter.com\/benwerd\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/twitter.com\/benwerd\u0022\u003EBen Werdmuller\u003C\/a\u003E hat eine gesunde Einstellung zu dem Thema:\u003C\/p\u003E\u003Cblockquote class=\u0022wp-block-quote\u0022\u003E\n\u003Cp\u003EI\u2019m so burned out by open source social, but I\u2019m glad to see people throw energy at the problem, even if it\u2019s not how I would have gone about it.\u003C\/p\u003E\n\u003Ccite\u003E\u003Ca href=\u0022https:\/\/twitter.com\/benwerd\/status\/1582554417693270016\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/twitter.com\/benwerd\/status\/1582554417693270016\u0022\u003ETwitter\u003C\/a\u003E\u003C\/cite\u003E\u003C\/blockquote\u003E\u003Cp\u003EMehr hab ich dazu eigentlich nicht zu sagen, au\u00dfer dass wir in der \u003Ca href=\u0022https:\/\/neunetz.fm\/neunetzcast-93-was-wir-unter-dezentralitaet-verstehen-und-was-wir-uns-davon-erhoffen\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/neunetz.fm\/neunetzcast-93-was-wir-unter-dezentralitaet-verstehen-und-was-wir-uns-davon-erhoffen\/\u0022\u003Eaktuellen Folge\u003C\/a\u003E des neunetzcasts sehr ausgiebig \u00fcber genau dieses Problem gesprochen haben!\u003C\/p\u003E\u003Cp\u003E\u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/activitypub\/\u0022\u003E#activitypub\u003C\/a\u003E \u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/bluesky\/\u0022\u003E#bluesky\u003C\/a\u003E \u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/fediverse\/\u0022\u003E#fediverse\u003C\/a\u003E \u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/matrix\/\u0022\u003E#matrix\u003C\/a\u003E \u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/twitter\/\u0022\u003E#twitter\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/notiz.blog\/2022\/11\/14\/the-at-protocol\/\u0022\u003Ehttps:\/\/notiz.blog\/2022\/11\/14\/the-at-protocol\/\u003C\/a\u003E\u003C\/p\u003E","contentMap":{"de":"\u003Cp\u003EVor zwei Jahren wollte Twitter in das \u201eDezentrale Netzwerke\u201c-Business einsteigen und gr\u00fcndete eigens daf\u00fcr das \u003Ca href=\u0022https:\/\/notiz.blog\/2019\/12\/13\/twitiverse\/\u0022 data-type=\u0022post\u0022 data-id=\u002218831\u0022\u003EProjekt Bluesky\u003C\/a\u003E. In den folgenden zwei Jahren wurde viel evaluiert und diskutiert, was wohl die beste L\u00f6sung f\u00fcr Twitter sei und wir alle \u003Cem\u003Efieberten\u003C\/em\u003E mit ob es nun \u003Ca href=\u0022https:\/\/www.w3.org\/TR\/activitypub\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/www.w3.org\/TR\/activitypub\/\u0022\u003EActivityPub\u003C\/a\u003E oder doch \u003Ca href=\u0022https:\/\/matrix.org\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/matrix.org\/\u0022\u003EMatrix\u003C\/a\u003E werden w\u00fcrde\u2026 \u003C\/p\u003E\u003Cp\u003EAber das Warten hat ein Ende! \u003Ca href=\u0022https:\/\/blueskyweb.xyz\/blog\/10-18-2022-the-at-protocol\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/blueskyweb.xyz\/blog\/10-18-2022-the-at-protocol\u0022\u003EBluesky hat verk\u00fcndet wie es weiter geht\u003C\/a\u003E!\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESie entwickeln ein neues Protokoll!\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDas \u003Cem\u003EAT Protocol\u003C\/em\u003E, kurz f\u00fcr \u003Cem\u003EAuthenticated Transfer Protocol\u003C\/em\u003E!\u003C\/p\u003E\u003Cp\u003EIch hab mir die \u003Ca href=\u0022https:\/\/atproto.com\/guides\/faq\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/atproto.com\/guides\/faq\u0022\u003EFAQ\u003C\/a\u003E mal angeschaut und dort steht warum Bluesky sich gegen ActivityPub entschieden hat:\u003C\/p\u003E\u003Cblockquote class=\u0022wp-block-quote\u0022\u003E\n\u003Cp\u003EAccount portability is the major reason why we chose to build a separate protocol. We consider portability to be crucial because it protects users from sudden bans, server shutdowns, and policy disagreements. Our solution for portability requires both \u003Ca href=\u0022https:\/\/atproto.com\/guides\/data-repos\u0022\u003Esigned data repositories\u003C\/a\u003E and \u003Ca href=\u0022https:\/\/atproto.com\/guides\/identity\u0022\u003EDIDs\u003C\/a\u003E, neither of which are easy to retrofit into ActivityPub. The migration tools for ActivityPub are comparatively limited; they require the original server to provide a redirect and cannot migrate the user\u2019s previous data.\u003C\/p\u003E\n\u003C\/blockquote\u003E\u003Cp\u003EDas erinnert mich ein bisschen an die Subline von meinem \u003Ca href=\u0022https:\/\/pfefferle.dev\/openwebicons\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/pfefferle.dev\/openwebicons\/\u0022\u003EOpenWeb-Icons Font\u003C\/a\u003E:\u003C\/p\u003E\u003Cblockquote class=\u0022wp-block-quote\u0022\u003E\n\u003Cp\u003EWhy \u003Cem\u003EOpenWeb Icons\u003C\/em\u003E? Because \u003Ca href=\u0022https:\/\/fortawesome.com\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/fortawesome.com\/\u0022\u003EFont Awesome\u003C\/a\u003E had no RSS-icon [\u2026]\u003C\/p\u003E\n\u003C\/blockquote\u003E\u003Cp\u003E\u003Cstrong\u003EWeil ActivityPub keine perfekte L\u00f6sung f\u00fcr \u201eAccount portability\u201c hat, bauen sie ein komplett neues Protokoll?\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EActivityPub ist sicherlich nicht \u201efeature complete\u201c, aber ein guter erster Wurf, was das Fediverse erfolgreich bewiesen hat! Warum arbeitet Twitter also lieber an einem eigen Format anstatt mit dem W3C zusammen an ActivityPub v2?\u003C\/p\u003E\u003Cp\u003EWarum macht sich das W3C \u00fcberhaupt noch die M\u00fche \u201eStandards\u201c zu definieren?\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EWegen der Interoperabilit\u00e4t!\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EW\u00fcrde Twitter mit HTTP(S), HTML oder CSS \u00e4hnlich umgehen, w\u00fcrde der Browser einfach leer bleiben, weil das \u0026$%\u00a7\u0026 Internet nur mit einheitlichen Standards funktioniert!\u003C\/p\u003E\u003Cp\u003EUnd das gleiche gilt auch f\u00fcr dezentralte Netze, zumindest wenn sie erfolgreich sein wollen! Dar\u00fcber hab ich tragischerweise schon vor \u003Cstrong\u003E10 Jahren\u003C\/strong\u003E geschrieben!\u003C\/p\u003E\u003Cblockquote class=\u0022wp-block-quote\u0022\u003E\n\u003Cp\u003EDiaspora* wurde kaum \u003Ca href=\u0022https:\/\/web.archive.org\/web\/20130630113539\/http:\/\/blog.diasporafoundation.org\/2012\/08\/27\/announcement-diaspora-will-now-be-a-community-project.html\u0022\u003Ef\u00fcr \u201etot\u201c erkl\u00e4rt\u003C\/a\u003E und schon steht das n\u00e4chste Projekt in den Startl\u00f6chern! \u003Ca href=\u0022https:\/\/web.archive.org\/web\/20190603031810\/https:\/\/tent.io\/\u0022\u003ETent.io\u003C\/a\u003E soll ein protocol for distributed social networking and personal data storage werden. Alles neu, alles anders, alles besser als OStatus, DiSo oder Diaspora*. Aber mal ganz ehrlich\u2026 was haben die Diasporas \u0026 Co. bisher geschaffen? Ziel war es Facebooks \u201eWalled Gardens\u201c aufzubrechen und was kam wirklich dabei rum? Eine ganze Reihe an dezentralen \u201eWalled Gardens\u201c. Na danke!\u003C\/p\u003E\n\u003Ccite\u003E\u003Ca href=\u0022https:\/\/notiz.blog\/2012\/11\/15\/dezentrale-walled-gardens\/\u0022\u003EDezentrale \u201eWalled Gardens\u201c\u003C\/a\u003E\u003C\/cite\u003E\u003C\/blockquote\u003E\u003Cp\u003EDas \u003Ca href=\u0022https:\/\/the-federation.info\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/the-federation.info\/\u0022\u003Efediverse\u003C\/a\u003E hat (wie schon erw\u00e4hnt) bisher einen gro\u00dfartigen Job gemacht und verschiedenste Netzwerke mit den verschiedensten Auspr\u00e4gungen vernetzt! Ich \u003Cs\u003Eglaube\u003C\/s\u003E bin der festen \u00dcberzeugung, dass sich diesmal wirklich das offene Format (\u003Cem\u003EActivityPub\u003C\/em\u003E) durchsetzen wird und Blueskys \u003Cem\u003EAuthenticated Transfer Protocol\u003C\/em\u003E auch in ein paar Monaten oder Jahren keine Rolle spielen wird! \u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/twitter.com\/benwerd\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/twitter.com\/benwerd\u0022\u003EBen Werdmuller\u003C\/a\u003E hat eine gesunde Einstellung zu dem Thema:\u003C\/p\u003E\u003Cblockquote class=\u0022wp-block-quote\u0022\u003E\n\u003Cp\u003EI\u2019m so burned out by open source social, but I\u2019m glad to see people throw energy at the problem, even if it\u2019s not how I would have gone about it.\u003C\/p\u003E\n\u003Ccite\u003E\u003Ca href=\u0022https:\/\/twitter.com\/benwerd\/status\/1582554417693270016\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/twitter.com\/benwerd\/status\/1582554417693270016\u0022\u003ETwitter\u003C\/a\u003E\u003C\/cite\u003E\u003C\/blockquote\u003E\u003Cp\u003EMehr hab ich dazu eigentlich nicht zu sagen, au\u00dfer dass wir in der \u003Ca href=\u0022https:\/\/neunetz.fm\/neunetzcast-93-was-wir-unter-dezentralitaet-verstehen-und-was-wir-uns-davon-erhoffen\/\u0022 data-type=\u0022URL\u0022 data-id=\u0022https:\/\/neunetz.fm\/neunetzcast-93-was-wir-unter-dezentralitaet-verstehen-und-was-wir-uns-davon-erhoffen\/\u0022\u003Eaktuellen Folge\u003C\/a\u003E des neunetzcasts sehr ausgiebig \u00fcber genau dieses Problem gesprochen haben!\u003C\/p\u003E\u003Cp\u003E\u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/activitypub\/\u0022\u003E#activitypub\u003C\/a\u003E \u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/bluesky\/\u0022\u003E#bluesky\u003C\/a\u003E \u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/fediverse\/\u0022\u003E#fediverse\u003C\/a\u003E \u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/matrix\/\u0022\u003E#matrix\u003C\/a\u003E \u003Ca rel=\u0022tag\u0022 class=\u0022u-tag u-category\u0022 href=\u0022https:\/\/notiz.blog\/tag\/twitter\/\u0022\u003E#twitter\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/notiz.blog\/2022\/11\/14\/the-at-protocol\/\u0022\u003Ehttps:\/\/notiz.blog\/2022\/11\/14\/the-at-protocol\/\u003C\/a\u003E\u003C\/p\u003E"},"to":["https:\/\/www.w3.org\/ns\/activitystreams#Public"],"cc":["https:\/\/www.w3.org\/ns\/activitystreams#Public"],"attachment":[{"type":"Image","url":"https:\/\/notiz.blog\/wp-content\/uploads\/2022\/11\/the-at-protocol.png","mediaType":"image\/png","name":"The Logo of the AT Protocol"}],"tag":[{"type":"Hashtag","href":"https:\/\/notiz.blog\/tag\/activitypub\/","name":"#activitypub"},{"type":"Hashtag","href":"https:\/\/notiz.blog\/tag\/bluesky\/","name":"#bluesky"},{"type":"Hashtag","href":"https:\/\/notiz.blog\/tag\/fediverse\/","name":"#fediverse"},{"type":"Hashtag","href":"https:\/\/notiz.blog\/tag\/matrix\/","name":"#matrix"},{"type":"Hashtag","href":"https:\/\/notiz.blog\/tag\/twitter\/","name":"#twitter"}]}";s:8:"response";a:1:{s:4:"code";i:200;}}
\ No newline at end of file
diff --git a/tests/test-class-friends-feed-parser-activitypub.php b/tests/test-class-friends-feed-parser-activitypub.php
new file mode 100644
index 0000000..79f5a74
--- /dev/null
+++ b/tests/test-class-friends-feed-parser-activitypub.php
@@ -0,0 +1,326 @@
+<?php
+
+class Test_Friends_Feed_Parser_ActivityPub extends \WP_UnitTestCase {
+	public static $users = array();
+	private $friend_id;
+	private $friend_name;
+	private $actor;
+
+	public function test_incoming_post() {
+		$now = time() - 10;
+		$status_id = 123;
+
+		$posts = get_posts(
+			array(
+				'post_type' => \Friends\Friends::CPT,
+				'author' => $this->friend_id,
+			)
+		);
+
+		$post_count = count( $posts );
+
+		// Let's post a new Note through the REST API.
+		$date = gmdate( \DATE_W3C, $now++ );
+		$id = 'test' . $status_id;
+		$content = 'Test ' . $date . ' ' . rand();
+
+		$request = new \WP_REST_Request( 'POST', '/activitypub/1.0/users/' . get_current_user_id() . '/inbox' );
+		$request->set_param( 'type', 'Create' );
+		$request->set_param( 'id', $id );
+		$request->set_param( 'actor', $this->actor );
+
+		$attachment_url = 'https://mastodon.local/files/original/1234.png';
+		$attachment_width = 400;
+		$attachment_height = 600;
+		$request->set_param(
+			'object',
+			array(
+				'type' => 'Note',
+				'id' => $id,
+				'attributedTo' => $this->actor,
+				'content' => $content,
+				'url' => 'https://mastodon.local/users/akirk/statuses/' . ( $status_id++ ),
+				'published' => $date,
+				'attachment' => array(
+					array(
+						'type' => 'Document',
+						'mediaType' => 'image/png',
+						'url' => $attachment_url,
+						'name' => '',
+						'blurhash' => '',
+						'width' => $attachment_width,
+						'height' => $attachment_height,
+
+					),
+				),
+			)
+		);
+
+		$response = $this->server->dispatch( $request );
+		$this->assertEquals( 202, $response->get_status() );
+
+		$posts = get_posts(
+			array(
+				'post_type' => \Friends\Friends::CPT,
+				'author' => $this->friend_id,
+			)
+		);
+
+		$this->assertEquals( $post_count + 1, count( $posts ) );
+		$this->assertStringStartsWith( $content, $posts[0]->post_content );
+		$this->assertStringContainsString( '<img src="' . esc_url( $attachment_url ) . '" width="' . esc_attr( $attachment_width ) . '" height="' . esc_attr( $attachment_height ) . '"', $posts[0]->post_content );
+		$this->assertEquals( $this->friend_id, $posts[0]->post_author );
+
+		// Do another test post, this time with a URL that has an @-id.
+		$date = gmdate( \DATE_W3C, $now++ );
+		$id = 'test' . $status_id;
+		$content = 'Test ' . $date . ' ' . rand();
+
+		$request = new \WP_REST_Request( 'POST', '/activitypub/1.0/users/' . get_current_user_id() . '/inbox' );
+		$request->set_param( 'type', 'Create' );
+		$request->set_param( 'id', $id );
+		$request->set_param( 'actor', 'https://mastodon.local/@akirk' );
+		$request->set_param(
+			'object',
+			array(
+				'type' => 'Note',
+				'id' => $id,
+				'attributedTo' => 'https://mastodon.local/@akirk',
+				'content' => $content,
+				'url' => 'https://mastodon.local/users/akirk/statuses/' . ( $status_id++ ),
+				'published' => $date,
+			)
+		);
+
+		$response = $this->server->dispatch( $request );
+		$this->assertEquals( 202, $response->get_status() );
+
+		$posts = get_posts(
+			array(
+				'post_type' => \Friends\Friends::CPT,
+				'author' => $this->friend_id,
+			)
+		);
+
+		$this->assertEquals( $post_count + 2, count( $posts ) );
+		$this->assertEquals( $content, $posts[0]->post_content );
+		$this->assertEquals( $this->friend_id, $posts[0]->post_author );
+		$this->assertEquals( $this->friend_name, get_post_meta( $posts[0]->ID, 'author', true ) );
+	}
+
+	public function test_incoming_announce() {
+		$now = time() - 10;
+		$status_id = 123;
+
+		self::$users['https://notiz.blog/author/matthias-pfefferle/'] = array(
+			'url' => 'https://notiz.blog/author/matthias-pfefferle/',
+			'name'  => 'Matthias Pfefferle',
+		);
+
+		$posts = get_posts(
+			array(
+				'post_type' => \Friends\Friends::CPT,
+				'author' => $this->friend_id,
+			)
+		);
+
+		$post_count = count( $posts );
+
+		$date = gmdate( \DATE_W3C, $now++ );
+		$id = 'test' . $status_id;
+
+		$object = 'https://notiz.blog/2022/11/14/the-at-protocol/';
+
+		$request = new \WP_REST_Request( 'POST', '/activitypub/1.0/users/' . get_current_user_id() . '/inbox' );
+		$request->set_param( 'type', 'Announce' );
+		$request->set_param( 'id', $id );
+		$request->set_param( 'actor', $this->actor );
+		$request->set_param( 'published', $date );
+		$request->set_param( 'object', $object );
+
+		$response = $this->server->dispatch( $request );
+		$this->assertEquals( 202, $response->get_status() );
+
+		$p = wp_parse_url( $object );
+		$cache = __DIR__ . '/fixtures/' . sanitize_title( $p['host'] . '-' . $p['path'] ) . '.response';
+		$this->assertFileExists( $cache );
+
+		$object = json_decode( wp_remote_retrieve_body( unserialize( file_get_contents( $cache ) ) ) );
+
+		$posts = get_posts(
+			array(
+				'post_type' => \Friends\Friends::CPT,
+				'author' => $this->friend_id,
+			)
+		);
+
+		$this->assertEquals( $post_count + 1, count( $posts ) );
+		$this->assertStringContainsString( 'Dezentrale Netzwerke', $posts[0]->post_content );
+		$this->assertEquals( $this->friend_id, $posts[0]->post_author );
+		$this->assertEquals( 'Matthias Pfefferle', get_post_meta( $posts[0]->ID, 'author', true ) );
+
+	}
+	public function set_up() {
+		if ( ! class_exists( '\Friends\Friends' ) ) {
+			return $this->markTestSkipped( 'The Friends plugin is not loaded.' );
+		}
+		parent::set_up();
+
+		// Manually activate the REST server.
+		global $wp_rest_server;
+		$wp_rest_server = new \Spy_REST_Server();
+		$this->server   = $wp_rest_server;
+		do_action( 'rest_api_init' );
+
+		add_filter(
+			'rest_url',
+			function() {
+				return get_option( 'home' ) . '/wp-json/';
+			}
+		);
+
+		add_filter( 'pre_http_request', array( get_called_class(), 'pre_http_request' ), 10, 3 );
+		add_filter( 'http_response', array( get_called_class(), 'http_response' ), 10, 3 );
+		add_filter( 'http_request_host_is_external', array( get_called_class(), 'http_request_host_is_external' ), 10, 2 );
+		add_filter( 'http_request_args', array( get_called_class(), 'http_request_args' ), 10, 2 );
+		add_filter( 'pre_get_remote_metadata_by_actor', array( get_called_class(), 'pre_get_remote_metadata_by_actor' ), 10, 2 );
+
+		$user_id = $this->factory->user->create(
+			array(
+				'role'       => 'administrator',
+			)
+		);
+		wp_set_current_user( $user_id );
+
+		$this->friend_name = 'Alex Kirk';
+		$this->actor = 'https://mastodon.local/users/akirk';
+
+		$user_feed = \Friends\User_Feed::get_by_url( $this->actor );
+		if ( is_wp_error( $user_feed ) ) {
+			$this->friend_id = $this->factory->user->create(
+				array(
+					'display_name' => $this->friend_name,
+					'role'       => 'friend',
+				)
+			);
+			\Friends\User_Feed::save(
+				new \Friends\User( $this->friend_id ),
+				$this->actor,
+				array(
+					'parser' => 'activitypub',
+				)
+			);
+		} else {
+			$this->friend_id = $user_feed->get_friend_user()->ID;
+		}
+
+		self::$users[ $this->actor ] = array(
+			'url' => $this->actor,
+			'name'  => $this->friend_name,
+		);
+		self::$users['https://mastodon.local/@akirk'] = self::$users[ $this->actor ];
+
+		_delete_all_posts();
+	}
+
+	public function tear_down() {
+		remove_filter( 'pre_http_request', array( get_called_class(), 'pre_http_request' ) );
+		remove_filter( 'http_response', array( get_called_class(), 'http_response' ) );
+		remove_filter( 'http_request_host_is_external', array( get_called_class(), 'http_request_host_is_external' ) );
+		remove_filter( 'http_request_args', array( get_called_class(), 'http_request_args' ) );
+		remove_filter( 'pre_get_remote_metadata_by_actor', array( get_called_class(), 'pre_get_remote_metadata_by_actor' ) );
+	}
+
+	public static function pre_get_remote_metadata_by_actor( $pre, $actor ) {
+		if ( isset( self::$users[ $actor ] ) ) {
+			return self::$users[ $actor ];
+		}
+		return $pre;
+	}
+	public static function http_request_host_is_external( $in, $host ) {
+		if ( in_array( $host, array( 'mastodon.local' ), true ) ) {
+			return true;
+		}
+		return $in;
+	}
+	public static function http_request_args( $args, $url ) {
+		if ( in_array( parse_url( $url, PHP_URL_HOST ), array( 'mastodon.local' ), true ) ) {
+			$args['reject_unsafe_urls'] = false;
+		}
+		return $args;
+	}
+	public static function pre_http_request( $preempt, $request, $url ) {
+		$p = wp_parse_url( $url );
+		$cache = __DIR__ . '/fixtures/' . sanitize_title( $p['host'] . '-' . $p['path'] ) . '.response';
+		if ( file_exists( $cache ) ) {
+			return apply_filters(
+				'fake_http_response',
+				unserialize( file_get_contents( $cache ) ),
+				$p['scheme'] . '://' . $p['host'],
+				$url,
+				$request
+			);
+		}
+
+		$home_url = home_url();
+
+		// Pretend the url now is the requested one.
+		update_option( 'home', $p['scheme'] . '://' . $p['host'] );
+		$rest_prefix = home_url() . '/wp-json';
+
+		if ( false === strpos( $url, $rest_prefix ) ) {
+			// Restore the old home_url.
+			update_option( 'home', $home_url );
+			return $preempt;
+		}
+
+		$url = substr( $url, strlen( $rest_prefix ) );
+		$r   = new \WP_REST_Request( $request['method'], $url );
+		if ( ! empty( $request['body'] ) ) {
+			foreach ( $request['body'] as $key => $value ) {
+				$r->set_param( $key, $value );
+			}
+		}
+		global $wp_rest_server;
+		$response = $wp_rest_server->dispatch( $r );
+		// Restore the old url.
+		update_option( 'home', $home_url );
+
+		return apply_filters(
+			'fake_http_response',
+			array(
+				'headers'  => array(
+					'content-type' => 'text/json',
+				),
+				'body'     => wp_json_encode( $response->data ),
+				'response' => array(
+					'code' => $response->status,
+				),
+			),
+			$p['scheme'] . '://' . $p['host'],
+			$url,
+			$request
+		);
+	}
+
+	public static function http_response( $response, $args, $url ) {
+		$p = wp_parse_url( $url );
+		$cache = __DIR__ . '/fixtures/' . sanitize_title( $p['host'] . '-' . $p['path'] ) . '.response';
+		if ( ! file_exists( $cache ) ) {
+			$headers = wp_remote_retrieve_headers( $response );
+			file_put_contents(
+				$cache,
+				serialize(
+					array(
+						'headers'  => $headers->getAll(),
+						'body'     => wp_remote_retrieve_body( $response ),
+						'response' => array(
+							'code' => wp_remote_retrieve_response_code( $response ),
+						),
+					)
+				)
+			);
+		}
+		return $response;
+	}
+}