I think one of the most innovated ideas in social networks is DataPortability group. The DataPortability try to make personal data shared between social networks.
Just imagine you have registered on some social networks and want to sign up in new one. You shouldn't to fill in any profile information, search some friends and upload photos. Only you should do is agree this policy and the system take all necessary information from you previous social profiles.
DataPortability is not inventing any new standards, but use existence, such as RSS, APML, OAuth, openID, XMPP, XRI. They simply a complete reference design and put the pieces together.
