public function setup_hooks() {
		// Take this early opportunity to set the default 'type' param
		// to 'last_joined', which will ensure that BP_User_Query
		// trusts our order and does not try to apply its own.
		if ( empty( $this->query_vars_raw['type'] ) ) {
			$this->query_vars_raw['type'] = 'last_joined';
		}

		// Set the sort order.
		add_action( 'bp_pre_user_query', array( $this, 'set_orderby' ) );

		// Set up our populate_extras method.
		add_action( 'bp_user_query_populate_extras', array( $this, 'populate_group_member_extras' ), 10, 2 );
	}