diff --git a/activitypub.php b/activitypub.php
index 11e8be36..748fa095 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -29,6 +29,7 @@ require_once __DIR__ . '/includes/functions.php';
  */
 \defined( 'ACTIVITYPUB_REST_NAMESPACE' ) || \define( 'ACTIVITYPUB_REST_NAMESPACE', 'activitypub/1.0' );
 \defined( 'ACTIVITYPUB_EXCERPT_LENGTH' ) || \define( 'ACTIVITYPUB_EXCERPT_LENGTH', 400 );
+\defined( 'ACTIVITYPUB_NOTE_LENGTH' ) || \define( 'ACTIVITYPUB_NOTE_LENGTH', 400 );
 \defined( 'ACTIVITYPUB_SHOW_PLUGIN_RECOMMENDATIONS' ) || \define( 'ACTIVITYPUB_SHOW_PLUGIN_RECOMMENDATIONS', true );
 \defined( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS' ) || \define( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS', 3 );
 \defined( 'ACTIVITYPUB_HASHTAGS_REGEXP' ) || \define( 'ACTIVITYPUB_HASHTAGS_REGEXP', '(?:(?<=\s)|(?<=<p>)|(?<=<br>)|^)#([A-Za-z0-9_]+)(?:(?=\s|[[:punct:]]|$))' );
diff --git a/includes/rest/class-collection.php b/includes/rest/class-collection.php
index 02cc99bf..97f17676 100644
--- a/includes/rest/class-collection.php
+++ b/includes/rest/class-collection.php
@@ -218,7 +218,7 @@ class Collection {
 
 		if ( ! is_single_user() && User_Collection::BLOG_USER_ID === $user->get__id() ) {
 			$posts = array();
-		} elseif ( $sticky_posts ) {
+		} elseif ( is_array( $sticky_posts ) ) {
 			$args = array(
 				'post__in'            => $sticky_posts,
 				'ignore_sticky_posts' => 1,
diff --git a/includes/transformer/class-post.php b/includes/transformer/class-post.php
index f18693fb..2067677d 100644
--- a/includes/transformer/class-post.php
+++ b/includes/transformer/class-post.php
@@ -642,9 +642,15 @@ class Post extends Base {
 			return \ucfirst( $post_format_setting );
 		}
 
-		$has_title = post_type_supports( $this->wp_object->post_type, 'title' );
+		$has_title = \post_type_supports( $this->wp_object->post_type, 'title' );
+		$content   = \wp_strip_all_tags( $this->wp_object->post_content );
 
-		if ( ! $has_title ) {
+		// Check if the post has a title.
+		if (
+			! $has_title ||
+			! $this->wp_object->post_title ||
+			\strlen( $content ) <= ACTIVITYPUB_NOTE_LENGTH
+		) {
 			return 'Note';
 		}