bp_activity_save_link_data( $activity )

function bp_activity_save_link_data( $activity ) {

	if ( empty( $_POST['link_url'] ) ) {
		return;
	}

	// Ignore YouTube and Vimeo Preview link.
	if ( strpos( $_POST['link_url'], 'youtube' ) > 0 || strpos( $_POST['link_url'], 'youtu' ) > 0 || strpos( $_POST['link_url'], 'vimeo' ) > 0 ) {
		return;
	}

	$preview_data['url'] = $_POST['link_url'];

	if ( ! empty( $_POST['link_image'] ) ) {
		$attachment_id = bp_activity_media_sideload_attachment( $_POST['link_image'] );
		if ( $attachment_id ) {
			$preview_data['attachment_id'] = $attachment_id;
		}
	}

	if ( ! empty( $_POST['link_title'] ) ) {
		$preview_data['title'] = $_POST['link_title'];
	}

	if ( ! empty( $_POST['link_description'] ) ) {
		$preview_data['description'] = $_POST['link_description'];
	}

	bp_activity_update_meta( $activity->id, '_link_preview_data', $preview_data );
}