diff --git a/activitypub.php b/activitypub.php
index b9e84b6..08ff918 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -23,15 +23,15 @@ function init() {
 
 	require_once dirname( __FILE__ ) . '/includes/table/followers-list.php';
 	require_once dirname( __FILE__ ) . '/includes/class-signature.php';
-	require_once dirname( __FILE__ ) . '/includes/class-activity.php';
-	require_once dirname( __FILE__ ) . '/includes/db/class-followers.php';
+	require_once dirname( __FILE__ ) . '/includes/peer/class-followers.php';
 	require_once dirname( __FILE__ ) . '/includes/functions.php';
 
 	require_once dirname( __FILE__ ) . '/includes/class-activity-dispatcher.php';
 	\Activitypub\Activity_Dispatcher::init();
 
-	require_once dirname( __FILE__ ) . '/includes/class-post.php';
-	\Activitypub\Post::init();
+	require_once dirname( __FILE__ ) . '/includes/model/class-activity.php';
+	require_once dirname( __FILE__ ) . '/includes/model/class-post.php';
+	\Activitypub\Model\Post::init();
 
 	require_once dirname( __FILE__ ) . '/includes/class-activitypub.php';
 	\Activitypub\Activitypub::init();
diff --git a/includes/class-activity-dispatcher.php b/includes/class-activity-dispatcher.php
index 6cd7280..7457db8 100644
--- a/includes/class-activity-dispatcher.php
+++ b/includes/class-activity-dispatcher.php
@@ -15,7 +15,7 @@ class Activity_Dispatcher {
 	public static function init() {
 		\add_action( 'activitypub_send_post_activity', array( '\Activitypub\Activity_Dispatcher', 'send_post_activity' ) );
 		\add_action( 'activitypub_send_update_activity', array( '\Activitypub\Activity_Dispatcher', 'send_update_activity' ) );
-		//\add_action( 'activitypub_send_delete_activity', array( '\Activitypub\Activity_Dispatcher', 'send_delete_activity' ) );
+		\add_action( 'activitypub_send_delete_activity', array( '\Activitypub\Activity_Dispatcher', 'send_delete_activity' ) );
 	}
 
 	/**
@@ -27,8 +27,8 @@ class Activity_Dispatcher {
 		$post = \get_post( $post_id );
 		$user_id = $post->post_author;
 
-		$activitypub_post = new \Activitypub\Post( $post );
-		$activitypub_activity = new \Activitypub\Activity( 'Create', \Activitypub\Activity::TYPE_FULL );
+		$activitypub_post = new \Activitypub\Model\Post( $post );
+		$activitypub_activity = new \Activitypub\Model\Activity( 'Create', \Activitypub\Model\Activity::TYPE_FULL );
 		$activitypub_activity->from_post( $activitypub_post->to_array() );
 
 		foreach ( \Activitypub\get_follower_inboxes( $user_id ) as $inbox => $to ) {
@@ -48,8 +48,8 @@ class Activity_Dispatcher {
 		$post = \get_post( $post_id );
 		$user_id = $post->post_author;
 
-		$activitypub_post = new \Activitypub\Post( $post );
-		$activitypub_activity = new \Activitypub\Activity( 'Update', \Activitypub\Activity::TYPE_FULL );
+		$activitypub_post = new \Activitypub\Model\Post( $post );
+		$activitypub_activity = new \Activitypub\Model\Activity( 'Update', \Activitypub\Model\Activity::TYPE_FULL );
 		$activitypub_activity->from_post( $activitypub_post->to_array() );
 
 		foreach ( \Activitypub\get_follower_inboxes( $user_id ) as $inbox => $to ) {
@@ -69,8 +69,8 @@ class Activity_Dispatcher {
 		$post = \get_post( $post_id );
 		$user_id = $post->post_author;
 
-		$activitypub_post = new \Activitypub\Post( $post );
-		$activitypub_activity = new \Activitypub\Activity( 'Delete', \Activitypub\Activity::TYPE_FULL );
+		$activitypub_post = new \Activitypub\Model\Post( $post );
+		$activitypub_activity = new \Activitypub\Model\Activity( 'Delete', \Activitypub\Model\Activity::TYPE_FULL );
 		$activitypub_activity->from_post( $activitypub_post->to_array() );
 
 		foreach ( \Activitypub\get_follower_inboxes( $user_id ) as $inbox => $to ) {
diff --git a/includes/functions.php b/includes/functions.php
index d7a2264..4eeeb33 100644
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -12,28 +12,8 @@ function get_context() {
 		'https://w3id.org/security/v1',
 		array(
 			'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
-			'sensitive' => 'as:sensitive',
-			'movedTo' => array(
-				'@id' => 'as:movedTo',
-				'@type' => '@id',
-			),
-			'Hashtag' => 'as:Hashtag',
-			'ostatus' => 'http://ostatus.org#',
-			'atomUri' => 'ostatus:atomUri',
-			'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
-			'conversation' => 'ostatus:conversation',
-			'toot' => 'http://joinmastodon.org/ns#',
-			'Emoji' => 'toot:Emoji',
-			'focalPoint' => array(
-				'@container' => '@list',
-				'@id' => 'toot:focalPoint',
-			),
-			'featured' => array(
-				'@id' => 'toot:featured',
-				'@type' => '@id',
-			),
-			'schema' => 'http://schema.org#',
 			'PropertyValue' => 'schema:PropertyValue',
+			'schema' => 'http://schema.org#',
 			'value' => 'schema:value',
 		),
 	);
@@ -185,7 +165,7 @@ function get_publickey_by_actor( $actor, $key_id ) {
 }
 
 function get_follower_inboxes( $user_id ) {
-	$followers = \Activitypub\Db\Followers::get_followers( $user_id );
+	$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
 	$inboxes = array();
 
 	foreach ( $followers as $follower ) {
@@ -223,7 +203,7 @@ function get_identifier_settings( $user_id ) {
 }
 
 function get_followers( $user_id ) {
-	$followers = \Activitypub\Db\Followers::get_followers( $user_id );
+	$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
 
 	if ( ! $followers ) {
 		return array();
@@ -237,3 +217,51 @@ function count_followers( $user_id ) {
 
 	return \count( $followers );
 }
+
+/**
+ * Examine a url and try to determine the author ID it represents.
+ *
+ * Checks are supposedly from the hosted site blog.
+ *
+ * @param string $url Permalink to check.
+ *
+ * @return int User ID, or 0 on failure.
+ */
+function url_to_authorid( $url ) {
+	global $wp_rewrite;
+
+	// check if url hase the same host
+	if ( wp_parse_url( site_url(), PHP_URL_HOST ) !== wp_parse_url( $url, PHP_URL_HOST ) ) {
+		return 0;
+	}
+
+	// first, check to see if there is a 'author=N' to match against
+	if ( preg_match( '/[?&]author=(\d+)/i', $url, $values ) ) {
+		$id = absint( $values[1] );
+		if ( $id ) {
+			return $id;
+		}
+	}
+
+	// check to see if we are using rewrite rules
+	$rewrite = $wp_rewrite->wp_rewrite_rules();
+
+	// not using rewrite rules, and 'author=N' method failed, so we're out of options
+	if ( empty( $rewrite ) ) {
+		return 0;
+	}
+
+	// generate rewrite rule for the author url
+	$author_rewrite = $wp_rewrite->get_author_permastruct();
+	$author_regexp = str_replace( '%author%', '', $author_rewrite );
+
+	// match the rewrite rule with the passed url
+	if ( preg_match( '/https?:\/\/(.+)' . preg_quote( $author_regexp, '/' ) . '([^\/]+)/i', $url, $match ) ) {
+		$user = get_user_by( 'slug', $match[2] );
+		if ( $user ) {
+			return $user->ID;
+		}
+	}
+
+	return 0;
+}
diff --git a/includes/class-activity.php b/includes/model/class-activity.php
similarity index 98%
rename from includes/class-activity.php
rename to includes/model/class-activity.php
index 4b4df84..0cfc1c6 100644
--- a/includes/class-activity.php
+++ b/includes/model/class-activity.php
@@ -1,5 +1,5 @@
 <?php
-namespace Activitypub;
+namespace Activitypub\Model;
 
 /**
  * ActivityPub Post Class
diff --git a/includes/class-post.php b/includes/model/class-post.php
similarity index 96%
rename from includes/class-post.php
rename to includes/model/class-post.php
index 2e2e2d5..0b2b809 100644
--- a/includes/class-post.php
+++ b/includes/model/class-post.php
@@ -1,5 +1,5 @@
 <?php
-namespace Activitypub;
+namespace Activitypub\Model;
 
 /**
  * ActivityPub Post Class
@@ -13,8 +13,8 @@ class Post {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_filter( 'activitypub_the_summary', array( '\Activitypub\Post', 'add_backlink_to_content' ), 15, 2 );
-		\add_filter( 'activitypub_the_content', array( '\Activitypub\Post', 'add_backlink_to_content' ), 15, 2 );
+		\add_filter( 'activitypub_the_summary', array( '\Activitypub\Model\Post', 'add_backlink_to_content' ), 15, 2 );
+		\add_filter( 'activitypub_the_content', array( '\Activitypub\Model\Post', 'add_backlink_to_content' ), 15, 2 );
 	}
 
 	public function __construct( $post = null ) {
diff --git a/includes/db/class-followers.php b/includes/peer/class-followers.php
similarity index 98%
rename from includes/db/class-followers.php
rename to includes/peer/class-followers.php
index 30fe5db..9e97a5e 100644
--- a/includes/db/class-followers.php
+++ b/includes/peer/class-followers.php
@@ -1,5 +1,5 @@
 <?php
-namespace Activitypub\Db;
+namespace Activitypub\Peer;
 
 /**
  * ActivityPub Followers DB-Class
diff --git a/includes/rest/class-followers.php b/includes/rest/class-followers.php
index 3f6b588..2d3d9ea 100644
--- a/includes/rest/class-followers.php
+++ b/includes/rest/class-followers.php
@@ -62,7 +62,7 @@ class Followers {
 
 		$json->partOf = \get_rest_url( null, "/activitypub/1.0/users/$user_id/followers" ); // phpcs:ignore
 		$json->totalItems = \Activitypub\count_followers( $user_id ); // phpcs:ignore
-		$json->orderedItems = \Activitypub\Db\Followers::get_followers( $user_id ); // phpcs:ignore
+		$json->orderedItems = \Activitypub\Peer\Followers::get_followers( $user_id ); // phpcs:ignore
 
 		$json->first = $json->partOf; // phpcs:ignore
 
diff --git a/includes/rest/class-inbox.php b/includes/rest/class-inbox.php
index fc1c3be..b9bafba 100644
--- a/includes/rest/class-inbox.php
+++ b/includes/rest/class-inbox.php
@@ -30,7 +30,7 @@ class Inbox {
 			'activitypub/1.0', '/inbox', array(
 				array(
 					'methods'  => \WP_REST_Server::EDITABLE,
-					'callback' => array( '\Activitypub\Rest\Inbox', 'global_inbox' ),
+					'callback' => array( '\Activitypub\Rest\Inbox', 'shared_inbox' ),
 				),
 			)
 		);
@@ -87,7 +87,6 @@ class Inbox {
 	 */
 	public static function user_inbox( $request ) {
 		$author_id = $request->get_param( 'id' );
-		$author    = \get_user_by( 'ID', $author_id );
 
 		$data = \json_decode( $request->get_body(), true );
 
@@ -113,9 +112,62 @@ class Inbox {
 	 *
 	 * @return WP_Error not yet implemented
 	 */
-	public static function global_inbox( $request ) {
-		// Create the response object
-		return new \WP_Error( 'rest_not_implemented', \__( 'This method is not yet implemented', 'activitypub' ), array( 'status' => 501 ) );
+	public static function shared_inbox( $request ) {
+		$data = \json_decode( $request->get_body(), true );
+
+		if ( empty( $data['to'] ) ) {
+			return new \WP_Error( 'rest_invalid_data', \__( 'No receiving actor set', 'activitypub' ), array( 'status' => 422 ) );
+		}
+
+		if ( \filter_var( $data['to'], \FILTER_VALIDATE_URL ) ) {
+			$author_id = \Activitypub\url_to_authorid( $data['to'] );
+
+			if ( ! $author_id ) {
+				return new \WP_Error( 'rest_invalid_data', \__( 'No matching user', 'activitypub' ), array( 'status' => 422 ) );
+			}
+		} else {
+			// get the identifier at the left of the '@'
+			$parts = \explode( '@', $data['to'] );
+
+			if ( 3 === \count( $parts ) ) {
+				$username = $parts[1];
+				$host = $parts[2];
+			} elseif ( 2 === \count( $parts ) ) {
+				$username = $parts[0];
+				$host = $parts[1];
+			}
+
+			if ( ! $username || ! $host ) {
+				return new \WP_Error( 'rest_invalid_data', \__( 'Invalid actor identifier', 'activitypub' ), array( 'status' => 422 ) );
+			}
+
+			// check domain
+			if ( ! \wp_parse_url( \home_url(), \PHP_URL_HOST ) !== $host ) {
+				return new \WP_Error( 'rest_invalid_data', \__( 'Invalid host', 'activitypub' ), array( 'status' => 422 ) );
+			}
+
+			$author = \get_user_by( 'login', $username );
+
+			if ( ! $author ) {
+				return new \WP_Error( 'rest_invalid_data', \__( 'No matching user', 'activitypub' ), array( 'status' => 422 ) );
+			}
+
+			$author_id = $author->ID;
+		}
+
+		$type = 'create';
+		if ( ! empty( $data['type'] ) ) {
+			$type = \strtolower( $data['type'] );
+		}
+
+		if ( ! \is_array( $data ) || ! \array_key_exists( 'type', $data ) ) {
+			return new \WP_Error( 'rest_invalid_data', \__( 'Invalid payload', 'activitypub' ), array( 'status' => 422 ) );
+		}
+
+		\do_action( 'activitypub_inbox', $data, $author_id, $type );
+		\do_action( "activitypub_inbox_{$type}", $data, $author_id );
+
+		return new \WP_REST_Response( array(), 202 );
 	}
 
 	/**
@@ -150,13 +202,13 @@ class Inbox {
 		}
 
 		// save follower
-		\Activitypub\Db\Followers::add_follower( $object['actor'], $user_id );
+		\Activitypub\Peer\Followers::add_follower( $object['actor'], $user_id );
 
 		// get inbox
 		$inbox = \Activitypub\get_inbox_by_actor( $object['actor'] );
 
 		// send "Accept" activity
-		$activity = new \Activitypub\Activity( 'Accept', \Activitypub\Activity::TYPE_SIMPLE );
+		$activity = new \Activitypub\Model\Activity( 'Accept', \Activitypub\Model\Activity::TYPE_SIMPLE );
 		$activity->set_object( $object );
 		$activity->set_actor( \get_author_posts_url( $user_id ) );
 		$activity->set_to( $object['actor'] );
@@ -178,7 +230,7 @@ class Inbox {
 			return new \WP_Error( 'activitypub_no_actor', \__( 'No "Actor" found', 'activitypub' ) );
 		}
 
-		\Activitypub\Db\Followers::remove_follower( $object['actor'], $user_id );
+		\Activitypub\Peer\Followers::remove_follower( $object['actor'], $user_id );
 	}
 
 	/**
diff --git a/includes/rest/class-outbox.php b/includes/rest/class-outbox.php
index 5f1e41c..c7ddbcb 100644
--- a/includes/rest/class-outbox.php
+++ b/includes/rest/class-outbox.php
@@ -83,8 +83,8 @@ class Outbox {
 		}
 
 		foreach ( $posts as $post ) {
-			$activitypub_post = new \Activitypub\Post( $post );
-			$activitypub_activity = new \Activitypub\Activity( 'Create', \Activitypub\Activity::TYPE_NONE );
+			$activitypub_post = new \Activitypub\Model\Post( $post );
+			$activitypub_activity = new \Activitypub\Model\Activity( 'Create', \Activitypub\Model\Activity::TYPE_NONE );
 			$activitypub_activity->from_post( $activitypub_post->to_array() );
 			$json->orderedItems[] = $activitypub_activity->to_array(); // phpcs:ignore
 		}
diff --git a/includes/table/followers-list.php b/includes/table/followers-list.php
index 6c60104..965cb90 100644
--- a/includes/table/followers-list.php
+++ b/includes/table/followers-list.php
@@ -25,7 +25,7 @@ class Followers_List extends \WP_List_Table {
 
 		$this->items = array();
 
-		foreach ( \Activitypub\Db\Followers::get_followers( \get_current_user_id() ) as $follower ) {
+		foreach ( \Activitypub\Peer\Followers::get_followers( \get_current_user_id() ) as $follower ) {
 			$this->items[]['identifier'] = \esc_attr( $follower );
 		}
 	}
diff --git a/languages/activitypub.pot b/languages/activitypub.pot
index 70471bc..a6c7d7b 100644
--- a/languages/activitypub.pot
+++ b/languages/activitypub.pot
@@ -5,7 +5,7 @@ msgstr ""
 "Project-Id-Version: ActivityPub 0.8.3\n"
 "Report-Msgid-Bugs-To: "
 "https://wordpress.org/support/plugin/wordpress-activitypub\n"
-"POT-Creation-Date: 2019-09-30 06:07:59+00:00\n"
+"POT-Creation-Date: 2019-11-18 19:51:49+00:00\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
@@ -88,35 +88,35 @@ msgstr ""
 msgid "Fediverse"
 msgstr ""
 
-#: includes/db/class-followers.php:53
-msgid "Unknown Actor schema"
-msgstr ""
-
-#: includes/functions.php:104
+#: includes/functions.php:84
 msgid "The \"actor\" is no valid URL"
 msgstr ""
 
-#: includes/functions.php:130
+#: includes/functions.php:110
 msgid "No valid JSON data"
 msgstr ""
 
-#: includes/functions.php:158
+#: includes/functions.php:138
 msgid "No \"Inbox\" found"
 msgstr ""
 
-#: includes/functions.php:184
+#: includes/functions.php:164
 msgid "No \"Public-Key\" found"
 msgstr ""
 
-#: includes/functions.php:212
+#: includes/functions.php:192
 msgid "Profile identifier"
 msgstr ""
 
-#: includes/functions.php:217
+#: includes/functions.php:197
 #. translators: the webfinger resource
 msgid "Try to follow \"@%s\" in the Mastodon/Friendica search field."
 msgstr ""
 
+#: includes/peer/class-followers.php:53
+msgid "Unknown Actor schema"
+msgstr ""
+
 #: includes/rest/class-followers.php:46 includes/rest/class-followers.php:49
 #: includes/rest/class-following.php:46 includes/rest/class-following.php:49
 #: includes/rest/class-outbox.php:45 includes/rest/class-outbox.php:48
@@ -124,16 +124,28 @@ msgstr ""
 msgid "User not found"
 msgstr ""
 
-#: includes/rest/class-inbox.php:100
+#: includes/rest/class-inbox.php:99 includes/rest/class-inbox.php:164
 msgid "Invalid payload"
 msgstr ""
 
-#: includes/rest/class-inbox.php:118
-msgid "This method is not yet implemented"
+#: includes/rest/class-inbox.php:119
+msgid "No receiving actor set"
 msgstr ""
 
-#: includes/rest/class-inbox.php:149 includes/rest/class-inbox.php:178
-#: includes/rest/class-inbox.php:192 includes/rest/class-inbox.php:229
+#: includes/rest/class-inbox.php:126 includes/rest/class-inbox.php:152
+msgid "No matching user"
+msgstr ""
+
+#: includes/rest/class-inbox.php:141
+msgid "Invalid actor identifier"
+msgstr ""
+
+#: includes/rest/class-inbox.php:146
+msgid "Invalid host"
+msgstr ""
+
+#: includes/rest/class-inbox.php:201 includes/rest/class-inbox.php:230
+#: includes/rest/class-inbox.php:244 includes/rest/class-inbox.php:281
 msgid "No \"Actor\" found"
 msgstr ""
 
diff --git a/templates/followers-list.php b/templates/followers-list.php
index aa86c39..4776851 100644
--- a/templates/followers-list.php
+++ b/templates/followers-list.php
@@ -1,7 +1,7 @@
 <div class="wrap">
 	<h1><?php \esc_html_e( 'Followers (Fediverse)', 'activitypub' ); ?></h1>
 
-	<p><?php \printf( \__( 'You currently have %s followers.', 'activitypub' ), \esc_attr( \Activitypub\Db\Followers::count_followers( \get_current_user_id() ) ) ); ?></p>
+	<p><?php \printf( \__( 'You currently have %s followers.', 'activitypub' ), \esc_attr( \Activitypub\Peer\Followers::count_followers( \get_current_user_id() ) ) ); ?></p>
 
 	<?php $token_table = new \Activitypub\Table\Followers_List(); ?>
 
diff --git a/templates/json-author.php b/templates/json-author.php
index 2228871..21d3003 100644
--- a/templates/json-author.php
+++ b/templates/json-author.php
@@ -75,9 +75,9 @@ if ( \get_the_author_meta( 'user_url', $author_id ) ) {
 	);
 }
 
-//$json->endpoints = array(
-//	'sharedInbox' => \get_rest_url( null, '/activitypub/1.0/inbox' ),
-//);
+$json->endpoints = array(
+	'sharedInbox' => \get_rest_url( null, '/activitypub/1.0/inbox' ),
+);
 
 // filter output
 $json = \apply_filters( 'activitypub_json_author_array', $json );
diff --git a/templates/json-post.php b/templates/json-post.php
index 04f683f..ccd9fa9 100644
--- a/templates/json-post.php
+++ b/templates/json-post.php
@@ -1,7 +1,7 @@
 <?php
 $post = \get_post();
 
-$activitypub_post = new \Activitypub\Post( $post );
+$activitypub_post = new \Activitypub\Model\Post( $post );
 $json = \array_merge( array( '@context' => \Activitypub\get_context() ), $activitypub_post->to_array() );
 
 // filter output
diff --git a/tests/test-class-db-activitypub-followers.php b/tests/test-class-db-activitypub-followers.php
index 77e01e4..30c6cdb 100644
--- a/tests/test-class-db-activitypub-followers.php
+++ b/tests/test-class-db-activitypub-followers.php
@@ -9,7 +9,7 @@ class Test_Db_Activitypub_Followers extends WP_UnitTestCase {
 		);
 		update_user_meta( 1, 'activitypub_followers', $followers );
 
-		$db_followers = \Activitypub\Db\Followers::get_followers( 1 );
+		$db_followers = \Activitypub\Peer\Followers::get_followers( 1 );
 
 		$this->assertEquals( 3, count( $db_followers ) );
 
@@ -18,9 +18,9 @@ class Test_Db_Activitypub_Followers extends WP_UnitTestCase {
 
 	public function test_add_follower() {
 		$follower = 'https://example.com/author/' . time();
-		\Activitypub\Db\Followers::add_follower( $follower, 1 );
+		\Activitypub\Peer\Followers::add_follower( $follower, 1 );
 
-		$db_followers = \Activitypub\Db\Followers::get_followers( 1 );
+		$db_followers = \Activitypub\Peer\Followers::get_followers( 1 );
 
 		$this->assertContains( $follower, $db_followers );
 	}