Just how can I make use of Facebook as an OpenID carrier?
Facebook makes use of OAuth, while Google, Yahoo, AOL, and also MySpace make use of OpenID.
For websites that just approve OpenID, you will not have the ability to make use of Facebook. Several websites approve both OpenID along with Facebook, Twitter, LinkedIn, Windows LiveID, etc, that are various other non - OpenID remedies.
If you're aiming to add assistance for all these ID systems on your internet site, you could intend to look into Janrain's Engage.
As much as I recognize, Facebook permits you to visit to it making use of an additional carrier's OpenID account, yet does not in fact create an OpenID make up you to visit to various other websites. Does that make good sense?
See this Facebook Developer Blog Post for some even more details.