public function save() {
		global $wpdb;

		$bp = buddypress();

		$this->id                = apply_filters_ref_array( 'bp_activity_id_before_save',                array( $this->id,                &$this ) );
		$this->item_id           = apply_filters_ref_array( 'bp_activity_item_id_before_save',           array( $this->item_id,           &$this ) );
		$this->secondary_item_id = apply_filters_ref_array( 'bp_activity_secondary_item_id_before_save', array( $this->secondary_item_id, &$this ) );
		$this->user_id           = apply_filters_ref_array( 'bp_activity_user_id_before_save',           array( $this->user_id,           &$this ) );
		$this->primary_link      = apply_filters_ref_array( 'bp_activity_primary_link_before_save',      array( $this->primary_link,      &$this ) );
		$this->component         = apply_filters_ref_array( 'bp_activity_component_before_save',         array( $this->component,         &$this ) );
		$this->type              = apply_filters_ref_array( 'bp_activity_type_before_save',              array( $this->type,              &$this ) );
		$this->action            = apply_filters_ref_array( 'bp_activity_action_before_save',            array( $this->action,            &$this ) );
		$this->content           = apply_filters_ref_array( 'bp_activity_content_before_save',           array( $this->content,           &$this ) );
		$this->date_recorded     = apply_filters_ref_array( 'bp_activity_date_recorded_before_save',     array( $this->date_recorded,     &$this ) );
		$this->hide_sitewide     = apply_filters_ref_array( 'bp_activity_hide_sitewide_before_save',     array( $this->hide_sitewide,     &$this ) );
		$this->mptt_left         = apply_filters_ref_array( 'bp_activity_mptt_left_before_save',         array( $this->mptt_left,         &$this ) );
		$this->mptt_right        = apply_filters_ref_array( 'bp_activity_mptt_right_before_save',        array( $this->mptt_right,        &$this ) );
		$this->is_spam           = apply_filters_ref_array( 'bp_activity_is_spam_before_save',           array( $this->is_spam,           &$this ) );

		/**
		 * Fires before the current activity item gets saved.
		 *
		 * Please use this hook to filter the properties above. Each part will be passed in.
		 *
		 * @since 1.0.0
		 *
		 * @param BP_Activity_Activity $this Current instance of the activity item being saved. Passed by reference.
		 */
		do_action_ref_array( 'bp_activity_before_save', array( &$this ) );

		if ( 'wp_error' === $this->error_type && $this->errors->get_error_code() ) {
			return $this->errors;
		}

		if ( empty( $this->component ) || empty( $this->type ) ) {
			if ( 'bool' === $this->error_type ) {
				return false;
			} else {
				if ( empty( $this->component ) ) {
					$this->errors->add( 'bp_activity_missing_component' );
				} else {
					$this->errors->add( 'bp_activity_missing_type' );
				}

				return $this->errors;
			}
		}

		if ( empty( $this->primary_link ) ) {
			$this->primary_link = bp_loggedin_user_domain();
		}

		// If we have an existing ID, update the activity item, otherwise insert it.
		if ( ! empty( $this->id ) ) {
			$q = $wpdb->prepare( "UPDATE {$bp->activity->table_name} SET user_id = %d, component = %s, type = %s, action = %s, content = %s, primary_link = %s, date_recorded = %s, item_id = %d, secondary_item_id = %d, hide_sitewide = %d, is_spam = %d WHERE id = %d", $this->user_id, $this->component, $this->type, $this->action, $this->content, $this->primary_link, $this->date_recorded, $this->item_id, $this->secondary_item_id, $this->hide_sitewide, $this->is_spam, $this->id );
		} else {
			$q = $wpdb->prepare( "INSERT INTO {$bp->activity->table_name} ( user_id, component, type, action, content, primary_link, date_recorded, item_id, secondary_item_id, hide_sitewide, is_spam ) VALUES ( %d, %s, %s, %s, %s, %s, %s, %d, %d, %d, %d )", $this->user_id, $this->component, $this->type, $this->action, $this->content, $this->primary_link, $this->date_recorded, $this->item_id, $this->secondary_item_id, $this->hide_sitewide, $this->is_spam );
		}

		if ( false === $wpdb->query( $q ) ) {
			return false;
		}

		// If this is a new activity item, set the $id property.
		if ( empty( $this->id ) ) {
			$this->id = $wpdb->insert_id;

			// If an existing activity item, prevent any changes to the content generating new @mention notifications.
		} else {
			add_filter( 'bp_activity_at_name_do_notifications', '__return_false' );
		}

		/**
		 * Fires after an activity item has been saved to the database.
		 *
		 * @since 1.0.0
		 *
		 * @param BP_Activity_Activity $this Current instance of activity item being saved. Passed by reference.
		 */
		do_action_ref_array( 'bp_activity_after_save', array( &$this ) );

		return true;
	}