/**
  * generate Wildcard.. truncate if necessary, $pUrl is optional
  *
  * @param YiidActivity $pActivity
  * @return string
  */
 public function generateMessage($pActivity)
 {
     if ($pActivity->getDomainProfile() && $pActivity->getDomainProfile()->getFlattrAccount()) {
         $auto_submit = "http://flattr.com/submit/auto?url=" . urlencode($pActivity->getUrl()) . "&user_id=" . $pActivity->getDomainProfile()->getFlattrAccount();
         $json = json_encode(array("url" => $auto_submit));
         return $json;
     }
     return;
 }