MySpace will announce support for the OpenID single sign-on framework sometime this week, we’ve heard from multiple sources. This will be the second largest implementation ever and will bring the total number of OpenID-enabled accounts to over half a billion. MySpace’s 200 million user IDs join Yahoo’s 250 million or so accounts, plus accounts from a number of other large providers.
Like most large company integrations, MySpace is at first becoming an OpenID issuer only, and may integrate as a relying party down the road. We’ve argued that becoming an issuer is essentially a land grab for user identities. The integration work on accepting OpenIDs from others is harder, and the payoff is less.
MySpace may also be writing code to extend the OpenID spec and allow easy integration of their Data Availability product to sites that accept MySpace OpenIDs.