BP_Akismet::check_member_activity_update( string $content, int $user_id, int $activity_id )

	public function check_member_activity_update( $content, $user_id, $activity_id ) {
		// By default, only handle activity updates and activity comments.
		if ( empty( $this->last_activity ) || !in_array( $this->last_activity->type, BP_Akismet::get_activity_types() ) )
			return;

		// Was this $activity_id just marked as spam? If not, bail out.
		if ( !$this->last_activity->id || $activity_id != $this->last_activity->id || 'false' == $this->last_activity->akismet_submission['bp_as_result'] )
			return;

		// It was, so delete the member's latest activity update.
		bp_delete_user_meta( $user_id, 'bp_latest_update' );
	}