diff --git a/includes/activity/class-event.php b/includes/activity/class-event.php
new file mode 100644
index 0000000..b22af97
--- /dev/null
+++ b/includes/activity/class-event.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * Inspired by the PHP ActivityPub Library by @Landrok
+ *
+ * @link https://github.com/landrok/activitypub
+ */
+
+namespace Activitypub\Activity;
+
+use ActivityPub\Activity\Base_Object;
+
+/**
+ * Event is an implementation of one of the
+ * Activity Streams Event object type
+ *
+ * The Object is the primary base type for the Activity Streams
+ * vocabulary.
+ *
+ * @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-event
+ */
+class Note extends Base_Object {
+    protected $type = 'Event';
+}
diff --git a/includes/activity/class-note.php b/includes/activity/class-note.php
new file mode 100644
index 0000000..f90fccc
--- /dev/null
+++ b/includes/activity/class-note.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * Inspired by the PHP ActivityPub Library by @Landrok
+ *
+ * @link https://github.com/landrok/activitypub
+ */
+
+namespace Activitypub\Activity;
+
+use ActivityPub\Activity\Base_Object;
+
+/**
+ * Note is an implementation of one of the
+ * Activity Streams Note object type
+ *
+ * The Object is the primary base type for the Activity Streams
+ * vocabulary.
+ *
+ * @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-note
+ */
+class Note extends Base_Object {
+    protected $type = 'Note';
+}
diff --git a/includes/base/class-transformer-base.php b/includes/base/class-transformer-base.php
index 0602c9d..890462e 100644
--- a/includes/base/class-transformer-base.php
+++ b/includes/base/class-transformer-base.php
@@ -5,13 +5,7 @@
  * @link https://github.com/landrok/activitypub
  */
 
-namespace Activitypub\Activity;
-
-use WP_Error;
-use ReflectionClass;
-
-use function Activitypub\camel_to_snake_case;
-use function Activitypub\snake_to_camel_case;
+namespace Activitypub;
 
 /**
  * Base class to implement WordPress to ActivityPub transformers.
@@ -26,7 +20,7 @@ abstract class Transformer_Base {
      * @return string[] An array containing all the supported post types.
 	 */
     public function get_supported_post_types() {
-        return \get_post_types( array(), 'names');
+        return \get_post_types( ['public' => true], 'names' );
     }
 
     /**
diff --git a/includes/class-admin.php b/includes/class-admin.php
index 866a8f7..cdf0a8c 100644
--- a/includes/class-admin.php
+++ b/includes/class-admin.php
@@ -25,7 +25,7 @@ class Admin {
 		}
 
 		add_filter( 'activitypub/transformers/is_transformer_enabled', function( $should_register, Transformer_Base $widget_instance ) {
-			return ! Options::is_element_disabled( $widget_instance->get_name() );
+			return ! Options::is_transformer_disabled( $transformer_instance->get_name() );
 		}, 10, 2 );
 	}
 
diff --git a/includes/managers/class-transformers-manager.php b/includes/managers/class-transformers-manager.php
index 2d3721a..983e95a 100644
--- a/includes/managers/class-transformers-manager.php
+++ b/includes/managers/class-transformers-manager.php
@@ -7,6 +7,8 @@
 
 namespace ActivityPub;
 
+use function Activitypub\camel_to_snake_case;
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit; // Exit if accessed directly.
 }
@@ -128,21 +130,44 @@ class Transformers_Manager {
 	}
 
 	/**
-	 * Register controls.
+	 * Init transformers.
 	 *
-	 * This method creates a list of all the supported controls by requiring the
-	 * control files and initializing each one of them.
+	 * Initialize ActivityPub transformer manager.
+	 * 
+	 * Include the builtin transformers by default and add third party ones.
 	 *
-	 * The list of supported controls includes the regular controls and the group
-	 * controls.
-	 *
-	 * External developers can register new controls by hooking to the
-	 * `elementor/controls/controls_registered` action.
-	 *
-	 * @since 3.1.0
+	 * @since version_number_transformer_management_placeholder
 	 * @access private
-	 */
-	private function register_controls() {
+	*/
+	private function init_transformers() {
+		$builtin_transformers = [
+			'post'
+		];
+
+		$this->_transformers = [];
+
+		foreach ( $builtin_transformers as $transformer_name ) {
+			include ACTIVITYPUB_PLUGIN_DIR . 'includes/transformers/class-' . $transformer_name . '.php';
+
+			$class_name = camel_to_snake_case( $transformer_name );
+
+			$class_name = __NAMESPACE__ . '\Transformer_' . $class_name;
+
+			$this->register( new $class_name() );
+		}
+
+		/**
+		 * After the transformers are registered.
+		 *
+		 * Fires after the built-in Actiitypub transformers are registered.
+		 *
+		 * @since version_number_transformer_management_placeholder
+		 *
+		 * @param Transformer_Manager $this The widgets manager.
+		 */
+		do_action( 'activitypub/transformers/register', $this );
 	}
 
-}
\ No newline at end of file
+
+}	
+