url = bp_core_get_user_domain( $author_id ); //add BP member profile URL as user URL
		// add BuddyPress' cover_image instead of WordPress' header_image
		$cover_image_url = bp_attachments_get_attachment( 'url', array( 'item_id' => $author_id ) );
		if ( $cover_image_url ) {
			$object->image = array(
				'type' => 'Image',
				'url'  => $cover_image_url,
			);
		}
		// change profile URL to BuddyPress' profile URL
		$object->attachment['profile_url'] = array(
			'type' => 'PropertyValue',
			'name' => \__( 'Profile', 'activitypub' ),
			'value' => \html_entity_decode(
				'' . \wp_parse_url( \bp_core_get_user_domain( $author_id ), \PHP_URL_HOST ) . '',
				\ENT_QUOTES,
				'UTF-8'
			),
		);
		// replace blog URL on multisite
		if ( is_multisite() ) {
			$user_blogs = get_blogs_of_user( $author_id ); //get sites of user to send as AP metadata
			if ( ! empty( $user_blogs ) ) {
				unset( $object->attachment['blog_url'] );
				foreach ( $user_blogs as $blog ) {
					if ( 1 !== $blog->userblog_id ) {
						$object->attachment[] = array(
							'type' => 'PropertyValue',
							'name' => $blog->blogname,
							'value' => \html_entity_decode(
								'' . \wp_parse_url( $blog->siteurl, \PHP_URL_HOST ) . '',
								\ENT_QUOTES,
								'UTF-8'
							),
						);
					}
				}
			}
		}
		return $object;
	}
}