code: function _getUserDetailsFromFacebook() {
      return facebook.query()
              .get('me?fields=' + profileFields)
              .auth(this.options.code)
              .request()
              .then(function(res){
                  this.socialUserInfo = res[1];
              }.bind(this));
  }
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