static function load_tweetback_info($article_id, $obj = '')
 {
     global $serendipity;
     // Assure, all tables exist!
     TwitterPluginDbAccess::install($obj);
     $query = "SELECT lasttweetid, lastcheck FROM {$serendipity['dbPrefix']}tweetbackhistory WHERE entryid={$article_id}";
     $row = serendipity_db_query($query, true);
     if (!is_array($row)) {
         // fresh search
         return null;
     } else {
         return $row;
     }
 }
 function install()
 {
     TwitterPluginDbAccess::install($this);
 }