The following article applies to Global Delivery Network project types.
You can authenticate users on your localized domains by using Facebook.
- Add the localized domains (ex, es.mysite.com) to the App Domains section of your Facebook App Settings dialog.
- Ensure that the "redirect_uri" in the call to Facebook points to the localized domain.
For more information, see the related Facebook developers page: http://developers.facebook.com/docs/reference/dialogs/oauth/