[accessTokenResponse description]
@param  {[type]} error                  [description]
@param  {[type]} accessToken       [description]
function accessTokenResponse(error, accessToken){
    if (error && typeof accessToken !== 'undefined') {
      waterlock.logger.debug(error);
      res.serverError();
    } else {
      fb.getMe(userInfoResponse);
    }
  }