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