function bp_legacy_theme_ajax_querystring( $query_string, $object ) {
	if ( empty( $object ) )
		return '';

	// Set up the cookies passed on this AJAX request. Store a local var to avoid conflicts.
	if ( ! empty( $_POST['cookie'] ) ) {
		$_BP_COOKIE = wp_parse_args( str_replace( '; ', '&', urldecode( $_POST['cookie'] ) ) );
	} else {
		$_BP_COOKIE = &$_COOKIE;
	}

	$qs = array();

	/**
	 * Check if any cookie values are set. If there are then override the
	 * default params passed to the template loop.
	 */

	// Activity stream filtering on action.
	if ( ! empty( $_BP_COOKIE['bp-' . $object . '-filter'] ) && '-1' != $_BP_COOKIE['bp-' . $object . '-filter'] ) {
		$qs[] = 'type=' . urlencode( $_BP_COOKIE['bp-' . $object . '-filter'] );

		if ( bp_is_active( 'activity' ) ) {
			$actions = bp_activity_get_actions_for_context();

			// Handle multiple actions (eg. 'friendship_accepted,friendship_created')
			$action_filter = explode( ',', $_BP_COOKIE['bp-' . $object . '-filter'] );

			// See if action filter matches registered actions. If so, add it to qs.
			if ( ! array_diff( $action_filter, wp_list_pluck( $actions, 'key' ) ) ) {
				$qs[] = 'action=' . join( ',', $action_filter );
			}
		}
	}

	if ( ! empty( $_BP_COOKIE['bp-' . $object . '-scope'] ) ) {
		if ( 'personal' == $_BP_COOKIE['bp-' . $object . '-scope'] ) {
			$user_id = ( bp_displayed_user_id() ) ? bp_displayed_user_id() : bp_loggedin_user_id();
			$qs[] = 'user_id=' . $user_id;
		}

		// Activity stream scope only on activity directory.
		if ( 'all' != $_BP_COOKIE['bp-' . $object . '-scope'] && ! bp_displayed_user_id() && ! bp_is_single_item() )
			$qs[] = 'scope=' . urlencode( $_BP_COOKIE['bp-' . $object . '-scope'] );
	}

	// If page and search_terms have been passed via the AJAX post request, use those.
	if ( ! empty( $_POST['page'] ) && '-1' != $_POST['page'] )
		$qs[] = 'page=' . absint( $_POST['page'] );

	// Excludes activity just posted and avoids duplicate ids.
	if ( ! empty( $_POST['exclude_just_posted'] ) ) {
		$just_posted = wp_parse_id_list( $_POST['exclude_just_posted'] );
		$qs[] = 'exclude=' . implode( ',', $just_posted );
	}

	// To get newest activities.
	if ( ! empty( $_POST['offset'] ) ) {
		$qs[] = 'offset=' . intval( $_POST['offset'] );
	}

	$object_search_text = bp_get_search_default_text( $object );
	if ( ! empty( $_POST['search_terms'] ) && is_string( $_POST['search_terms'] ) && $object_search_text != $_POST['search_terms'] && 'false' != $_POST['search_terms'] && 'undefined' != $_POST['search_terms'] )
		$qs[] = 'search_terms=' . urlencode( $_POST['search_terms'] );

	// Now pass the querystring to override default values.
	$query_string = empty( $qs ) ? '' : join( '&', (array) $qs );

	$object_filter = '';
	if ( isset( $_BP_COOKIE['bp-' . $object . '-filter'] ) )
		$object_filter = $_BP_COOKIE['bp-' . $object . '-filter'];

	$object_scope = '';
	if ( isset( $_BP_COOKIE['bp-' . $object . '-scope'] ) )
		$object_scope = $_BP_COOKIE['bp-' . $object . '-scope'];

	$object_page = '';
	if ( isset( $_BP_COOKIE['bp-' . $object . '-page'] ) )
		$object_page = $_BP_COOKIE['bp-' . $object . '-page'];

	$object_search_terms = '';
	if ( isset( $_BP_COOKIE['bp-' . $object . '-search-terms'] ) )
		$object_search_terms = $_BP_COOKIE['bp-' . $object . '-search-terms'];

	$object_extras = '';
	if ( isset( $_BP_COOKIE['bp-' . $object . '-extras'] ) )
		$object_extras = $_BP_COOKIE['bp-' . $object . '-extras'];

	/**
	 * Filters the AJAX query string for the component loops.
	 *
	 * @since 1.7.0
	 *
	 * @param string $query_string        The query string we are working with.
	 * @param string $object              The type of page we are on.
	 * @param string $object_filter       The current object filter.
	 * @param string $object_scope        The current object scope.
	 * @param string $object_page         The current object page.
	 * @param string $object_search_terms The current object search terms.
	 * @param string $object_extras       The current object extras.
	 */
	return apply_filters( 'bp_legacy_theme_ajax_querystring', $query_string, $object, $object_filter, $object_scope, $object_page, $object_search_terms, $object_extras );
}