social Auth server Meteor

Meteor.startup(() => {

  ServiceConfiguration.configurations.remove({
      service: "facebook"
  });

  ServiceConfiguration.configurations.insert({
      service: "facebook",
      appId: '***********',
      secret: '*******************'
  });
  Accounts.loginServiceConfiguration.remove({
    service: "twitter"
  });

  ServiceConfiguration.configurations.insert({
    service: "twitter",
    appId: '***************',
    secret: '*************'
  });

  Accounts.onCreateUser(function (options, user) {
      if (!user.services.facebook) {
          return user;
      }
      user.username = user.services.facebook.name;
      user.emails = [{address: user.services.facebook.email}];
      return user;
  });

});