public static function friendsList()
    {
        if (Podium::getInstance()->user->isGuest) {
            return null;
        }
        $logged = static::loggedId();
        $cache = Podium::getInstance()->podiumCache->getElement('user.friends', $logged);
        if ($cache === false) {
            $cache = [];
            $friends = static::findMe()->friends;
            if ($friends) {
                /* @var $friend User */
                foreach ($friends as $friend) {
                    $cache[$friend->id] = $friend->getPodiumTag(true);
                }
            }
            Podium::getInstance()->podiumCache->setElement('user.friends', $logged, $cache);
        }
        return $cache;
    }