code: function _getUserDetailsFromFacebook() {
      return BB
          .bind(this)
          .then(function() {
              return facebook.query()
                  .get('/me?access_token=' + this.params.access_token)
                  .request();
          })
          .then(function(res) {
              this.socialUserInfo = res[1];
          });
  }
docs: Function will obtian the user's social information from facebook and return it as user info to our promise chain. This info can later be used to look up our users a either create an account or log them in