public function getTwitter()
        {
            return isset($this->_data[self::PROFILE][self::TWITTER_USERNAME]) ? $this->_data[self::PROFILE][self::TWITTER_USERNAME] : null;
        }
public function getTwitter()
        {
            return isset($this->_data[self::PROFILE][self::TWITTER_USERNAME]) ? $this->_data[self::PROFILE][self::TWITTER_USERNAME] : null;
        }
public function getTwitter ( ) { return isset ( $ this -> _data [ self :: PROFILE ] [ self :: TWITTER_USERNAME ] ) ? $ this -> _data [ self :: PROFILE ] [ self :: TWITTER_USERNAME ] : null ; }
Retrieves the user's twitter username.

@return string
Retrieves the user s twitter username .