bp_get_activity_member_display_name()

	function bp_get_activity_member_display_name() {
		global $activities_template;

		$retval = isset( $activities_template->activity->display_name )
			? $activities_template->activity->display_name
			: '';

		/**
		 * Filters the display name of the member who posted the activity.
		 *
		 * @since BuddyPress 2.1.0
		 *
		 * @param int $retval Display name for the member who posted.
		 */
		return apply_filters( 'bp_get_activity_member_display_name', $retval );
	}