const USE_VKONTAKTE_YES = 1;
    const USE_VKONTAKTE_NO = 0;
    const USE_TWITTER_YES = 1;
    const USE_TWITTER_NO = 0;


    public static function getUseVkontakteOptions($selected = null)
    {
        $return[self::USE_VKONTAKTE_YES] = tc('Yes');
        $return[self::USE_VKONTAKTE_NO] = tc('No');

        if ($selected !== null) {
            if (isset($return[$selected]))
                return $return[$selected];

            return '-';
        }

        return $return;
    }

    public static function getUseTwitterOptions($selected = null)
    {
        $return[self::USE_TWITTER_YES] = tc('Yes');
        $return[self::USE_TWITTER_NO] = tc('No');

        if ($selected !== null) {
            if (isset($return[$selected]))
                return $return[$selected];

            return '-';
        }

        return $return;
    }