function create_short_urls($article_url)
 {
     $selected_services = array('raw');
     // preload shorturls, we have fetched before
     $shorturls = TwitterPluginDbAccess::load_short_urls($article_url, $selected_services);
     // remember already known shorturls
     $loaded_shorturls = $shorturls;
     $shorter = $this->get_urlshortener();
     foreach ($selected_services as $service) {
         $shorter->put_shorturl($service, $article_url, $shorturls);
     }
     TwitterPluginDbAccess::save_short_urls($article_url, $shorturls, $loaded_shorturls);
     return $shorturls;
 }