A Web identity reality check
The main reason no one uses OpenID is because Facebook Connect does the same thing and does it better. Everyone knows what Facebook is and it’s much easier to understand that Facebook is handling your identity than some vague, unrecognized thing called OpenID. That’s why, despite the impressive sounding billion URLs and 50,000 sites supporting OpenID, it pales next to Facebook Connect. Facebook Connect has been around less than half the time of OpenID and yet it’s been adopted by some 250,000 websites, is available to the hundreds of millions of Facebook users and has the advantage of Facebook’s brand familiarity.