I posted our own usage data for these services:
<a href="http://blog.crowdvine.com/2009/10/16/twitter-auth-vs-facebook-connect-vs-openid-for-conference-attendees/" rel="nofollow">http://blog.crowdvine.com/2009/10/16/twitter-auth-vs-faceboo...</a><p>The feeling I'm getting via my own anecdotal research of users behavior on our sites and from talking to people is that these are not major conveniences or site differentiators. The people I've talked to who seem most optimistic are looking for ways to make the experience more compelling than just saving the user from typing a password, for instance by auto-importing their contacts.