bp_activity_default_scope( string $scope = 'all' )

function bp_activity_default_scope( $scope = 'all' ) {
	$new_scope = array();

	if ( bp_loggedin_user_id() && ( 'all' === $scope || empty( $scope ) ) ) {

		$new_scope[] = 'public';

		if ( bp_is_activity_directory() || bp_is_single_activity() ) {
			$new_scope[] = 'just-me';

			if ( bp_is_activity_directory() ) {
				$new_scope[] = 'public';
			}

			if ( bp_activity_do_mentions() ) {
				$new_scope[] = 'mentions';
			}

			if ( bp_is_active( 'friends' ) ) {
				$new_scope[] = 'friends';
			}

			if ( bp_is_active( 'groups' ) ) {
				$new_scope[] = 'groups';
			}

			if ( bp_is_activity_follow_active() ) {
				$new_scope[] = 'following';
			}

			if ( bp_is_single_activity() && bp_is_active( 'media' ) ) {
				$new_scope[] = 'media';
				$new_scope[] = 'document';
			}

		} else if ( bp_is_user_activity() ) {
			if ( empty( bp_current_action() ) ) {
				$new_scope[] = 'just-me';
			} else {
				$new_scope[] = bp_current_action();
			}
		} else if ( bp_is_active( 'group' ) && bp_is_group_activity() ) {
			$new_scope[] = 'groups';
		}

	} else if( ! bp_loggedin_user_id() && ( 'all' === $scope || empty( $scope ) ) ) {
		$new_scope[] = 'public';
	}

	$new_scope = array_unique( $new_scope );

	if ( empty( $new_scope ) ) {
		$new_scope = (array) $scope;
	}

	/**
	 * Filter to update default scope.
	 *
	 * @since BuddyBoss 1.4.3
	 */
	$new_scope = apply_filters( 'bp_activity_default_scope', $new_scope );

	return implode( ',', $new_scope );

}