public function actionLogout($provider = null, $returnUrl = null)
    {
        /** @var ProfileForm */
        $model = $this->module->createFormModel('ProfileForm');
        // AuthForm creates an association using lowercase provider
        $model->getIdentity()->removeRemoteIdentity(strtolower($provider));
        $this->redirect($returnUrl !== null ? $returnUrl : Yii::app()->homeUrl);
    }