/**
  * @return FacebookDistributionProvider
  */
 public static function get()
 {
     if (!self::$instance) {
         self::$instance = new FacebookDistributionProvider();
     }
     return self::$instance;
 }
 /**
  * Return a distribution provider instance
  * 
  * @return IDistributionProvider
  */
 public static function getProvider()
 {
     return FacebookDistributionProvider::get();
 }