/**
  * Redirect process for a successful login
  *
  * @param   sfRequest $request
  * @param   sfUser    $user
  * @return  void
  */
 protected function _redirectSuccess($request, $user)
 {
     $signinUrl = sfConfig::get('app_facebook_success_signin_url', $user->getReferer($request->getReferer()));
     $this->redirect('' != $signinUrl ? $signinUrl : '@homepage');
 }