public function addHashtag($term)
    {
        $term = trim($term);

        //@todo implement is_hashtag filter method
        if (!is_string($term)) {
            return;
        }

        if ($hashtag = $this->getService('repos:hashtags.hashtag')->findOrAddNew(array('name' => $term))) {
            $this->hashtags->insert($hashtag);

            return $this;
        }

        return;
    }