bp_get_media_attachment_image_thumbnail()

function bp_get_media_attachment_image_thumbnail() {
	global $media_template;

	/**
	 * Filters the media thumbnail being displayed.
	 *
	 * @since BuddyBoss 1.0.0
	 *
	 * @param string The media thumbnail.
	 */
	return apply_filters( 'bp_get_media_attachment_image', $media_template->media->attachment_data->thumb );
}