Is Facebook an OpenID provider? I know they are an OpenID supporter but do they allow people to authenticate with other sites via OpenID with their Facebook credentials?
In mid-January 2008, Yahoo! announced initial OpenID 2.0 support, both as a provider and as a relying party, releasing the provider service by the end of the month. In early February, Google, IBM, Microsoft, VeriSign and Yahoo! joined the OpenID Foundation as corporate board members.
Logging into Spotify with your Facebook account is a good example of how OpenID could be applied: You log into Facebook. Facebook sends your name and e-mail to Spotify. Spotify uses those details to identify you.
Simply put, OpenID is used for authentication while OAuth is used for authorization. OpenID was created for federated authentication, meaning that it lets a third-party application authenticate users for you using accounts that you already have.
No, they're not an OpenId provider. They use their own OpenID-like system called Facebook connect, which you can use to authenticate users on your site, among other features.
You can check it out here: https://developers.facebook.com/docs/facebook-login
There is an unofficial Facebook OpenID Provider available at:
http://facebook-openid.appspot.com/
You can eaisly use it to log in any OpenID site with Facebook accounts.
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