--- js/facebook_share.js	2011-06-09 17:41:54.000000000 +0200
+++ js/facebook_share.js	2011-06-10 10:02:06.127171000 +0200
@@ -2,6 +2,7 @@
   $(document).ready(function(){
     $('a.service-links-facebook-widget').each(function(){
       $(this).attr('share_url', $(this).attr('rel'));
+      $(this).attr('expr:share_url', $(this).attr('rel'));
       $(this).attr('type', Drupal.settings.ws_fs.type);
       $(this).attr('name', 'fb_share');
     });