diff --git a/includes/iworks/class-iworks-opengraph.php b/includes/iworks/class-iworks-opengraph.php
index c6d21aa..45868a1 100644
--- a/includes/iworks/class-iworks-opengraph.php
+++ b/includes/iworks/class-iworks-opengraph.php
@@ -15,15 +15,16 @@ class iWorks_OpenGraph {
 	/**
 	 * Schema.org mapping
 	 *
+	 * @version 2.9.4
 	 * @since 2.9.3
+	 * @since 2.9.4 Removes invalid `<meta itemprop="author">` (fixes iworks/og#9)
 	 */
 	private $schema_org_mapping = array(
 		'name'          => array( 'og', 'title' ),
 		'headline'      => array( 'og', 'blogdescription' ),
 		'description'   => array( 'og', 'description' ),
 		'datePublished' => array( 'article', 'published_time' ),
-		'dateModified'  => array( 'article', 'modified_time' ),
-		'author'        => array( 'profile', 'username' ),
+		'dateModified'  => array( 'article', 'modified_time' )
 	);
 
 	/**
@@ -291,7 +292,6 @@ public function wp_head() {
 				'tag' => array(),
 			),
 			'twitter' => array(
-				'partner' => 'ogwp',
 				'site'    => apply_filters( 'og_twitter_site', '' ),
 				'creator' => apply_filters( 'og_twitter_creator', '' ),
 				'widgets' => apply_filters( 'og_twitter_widgets', array() ),
@@ -587,7 +587,7 @@ public function wp_head() {
 					/**
 					 * og:profile
 					 */
-					$og['article']['author'] = $this->get_the_author_meta_array( $post->post_author );
+					$og['article']['author'] = $this->get_the_author_meta_array( $post->post_author )['username'];
 					$og['profile']           = $this->get_the_author_meta_array( $post->post_author );
 				}
 				/**
@@ -884,7 +884,7 @@ public function wp_head() {
 		/**
 		 * Twitter
 		 */
-		foreach ( array( 'title', 'description', 'url' ) as $key ) {
+		foreach ( array( 'title', 'description' ) as $key ) {
 			if ( isset( $og['og'][ $key ] ) ) {
 				$og['twitter'][ $key ] = $og['og'][ $key ];
 			}
@@ -903,15 +903,6 @@ public function wp_head() {
 					}
 				}
 			}
-			/**
-			 * site slogan
-			 *
-			 * @since 3.2.3
-			 */
-			$og['schema']['tagline'] = apply_filters(
-				'og_schema_tagline',
-				get_option( 'blogdescription' )
-			);
 		}
 		/**
 		 * Produce image extra tags
@@ -1546,7 +1537,7 @@ private function get_type() {
 	}
 
 	/**
-	 * get user array
+	 * get user profile array
 	 *
 	 * @since 3.0.1
 	 */
@@ -1554,17 +1545,31 @@ private function get_the_author_meta_array( $author_id ) {
 		/**
 		 * Filter `og:profile` values.
 		 *
+		 * @version 2.8.0
 		 * @since 2.7.6
+		 * @since 2.8.0 Prevents leaking protected personal data (related to iworks/og#9)
+		 *
+		 * @link https://ogp.me/#type_profile
+		 * @link https://developer.wordpress.org/reference/functions/get_the_author_meta/
 		 *
-		 * @param array Array of `og:profile` values.
 		 * @param integer User ID.
+		 * @return array For `og:profile` and `og:article:author:` values.
 		 */
+		$author_display_name = get_the_author_meta( 'display_name', $author_id );
+		$author_first_name = get_the_author_meta( 'first_name', $author_id );
+		$author_last_name = get_the_author_meta( 'last_name', $author_id );
+		$author_nicename_is_fullname = ($author_display_name === $author_first_name.' '.$author_last_name ? true : false);
+
 		return apply_filters(
 			'og_profile',
-			array(
-				'first_name' => get_the_author_meta( 'first_name', $author_id ),
-				'last_name'  => get_the_author_meta( 'last_name', $author_id ),
-				'username'   => get_the_author_meta( 'display_name', $author_id ),
+			( $author_nicename_is_fullname ?
+				array(
+					 'first_name' => $author_first_name
+					,'last_name'  => $author_last_name
+					,'username'   => $author_display_name
+				) : array(
+					'username'   => $author_display_name
+				)
 			),
 			$author_id
 		);