private static function getFB()
 {
     $permisitos = 'email, user_birthday, user_location, publish_stream, manage_pages, offline_access';
     if (self::$fb) {
         return self::$fb;
     }
     $bootstrap = Zend_Controller_Front::getInstance()->getParam('bootstrap');
     $options = $bootstrap->getOptions();
     $fb = new Facebook_Facebook(array('appId' => $options['facebook']['appid'], 'secret' => $options['facebook']['appsecret'], 'cookie' => true, 'req_perms' => $permisitos));
     self::$fb = $fb;
     return self::$fb;
 }