public function Tags()
{
$select = array('Title');
$query = new SQLQuery($select, 'PostTag');
$query->selectField('count(PostTag.ID)', 'Number');
$query->selectField('PostTag.ID');
$query->addInnerjoin('MicroPost_Tags', 'PostTag.ID = MicroPost_Tags.PostTagID');
$date = date('Y-m-d H:i:s', strtotime('-1 month'));
$query->addWhere("MicroPost_Tags.Tagged > '{$date}'");
$query->addWhere('"PostTag"."Title" NOT LIKE \'SELF_TAG%\'');
$query->addGroupBy('PostTag.ID');
$query->setLimit(20);
$rows = $query->execute();
$tags = ArrayList::create();
foreach ($rows as $row) {
$data = new ArrayData($row);
$data->Link = Controller::join_links(TimelineController::URL_SEGMENT, '?tags=' . urlencode($data->Title));
$tags->push($data);
}
return $tags;
}