code: function _getUser(response) {
  
      if(response.status == 'connected') {
  
        // Return a Promise for the response with user details.
        return new Promise(function (resolve) {
  
          // Until here, `response` was FB's auth response. Here
          // we start to build bigger response by appending the Facebook's
          // user info in the `user` property.
          FB.api('/me', {
            fields: [
              'id',
              'first_name',
              'last_name' ,
              'gender',
              'link',
              'picture',
              'locale',
              'name',
              'timezone',
              'updated_time',
              'verified'
            ].toString()
          }, function (userInfo) {
            resolve(Utils.extend(response, { user: userInfo }));
          });
  
        });
  
      }else{
  
        // Return an already resolved promise.
        return new Promise(function (resolve) {
          resolve(response);
        });
  
      }
  
    }
docs: Fetch user info from Facebook if user is successfully connected.