A lot of things are happening very quickly in the social identity space. This post, which appeared a couple of days ago, is already a bit out of date. No matter; here are the latest slides from David Recordon and Brad Fitzpatrick. And here is the key thought for the day: "A lot that you have heard here is about platforms and who is going to win. That is Paleolithic thinking. The Web has already won. The web is the Platform." Quite right. Don't invest too much in one platform. Invest in the web.