public function TimelineUrl()
 {
     TimelineController::include_microblog_requirements();
     Requirements::javascript('microblog/javascript/timeline-dashlet.js');
     $tags = $this->ShowTaggedWith->getValues();
     $extra = '';
     if (count($tags)) {
         $extra = '?tags=' . urlencode(implode(',', $tags));
     }
     return 'timeline' . $extra;
 }