public static function get_by_user_id($id)
 {
     $result = array();
     $instance = new CRM_Civisocial_DAO_CivisocialUser();
     $instance->facebook_user_id = $id;
     $instance->find();
     while ($instance->fetch()) {
         $row = array();
         $instance->storeValues($instance, $row);
         $result[$row['id']] = $row;
     }
     return $result;
 }
 /**
  * Returns the list of fields that can be exported
  *
  * @param bool $prefix
  *
  * @return array
  */
 static function &export($prefix = false)
 {
     if (!self::$_export) {
         self::$_export = array();
         $fields = self::fields();
         foreach ($fields as $name => $field) {
             if (CRM_Utils_Array::value('export', $field)) {
                 if ($prefix) {
                     self::$_export['al_user'] =& $fields[$name];
                 } else {
                     self::$_export[$name] =& $fields[$name];
                 }
             }
         }
     }
     return self::$_export;
 }