Current state of Facebook OpenID support

I'm reading conflicting re开发者_开发知识库ports of Facebook OpenID support. A Facebook blog post from 2009 states that they do, but apparently there is OAuth and Facebook Connect. Or do they only support other OpenID logins on Facebook itself? I have only used JanRain's RPXNow up to now, so integrating directly with OpenID is new to me.

• As of December 2010, does Facebook support OpenID logins on external sites with a Facebook account?

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Facebook is an Relying Party, so you can sign in to facebook using an OpenID.
Is is not a provider, however, so you can't sign in to other websites using your facebook account - at least not using OpenID.

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Facebook is not an OpenID provider. There is no OpenID from Facebook you can use on other pages to login. But there are some third party servers that work as proxies. You connect them to Facebook and they provide an OpenID. In the end you have an OpenID if you are logged into Facebook.

Facebook is not even an OpenID customer. There is no page where you could enter your OpenID to login on Facebook. Yes, you can set up OpenID providers, Google or some other services as so called "Linked accounts". They promise: "If you are logged into one of the accounts below you will automatically be logged into Facebook." But it does not work and it technically can not work as long as Facebook does not ask for the OpenID.