Google’s announcement today of the Social Graph API is a major step in the development of what I’ve called “the Internet Operating System.” In a nutshell, what the Social Graph API does is to lower the barrier to re-use of information that people publish about themselves on the web. It’s the next step towards the vision that Brad Fitzpatrick and David Recordon outlined in Thoughts on the Social Graph.
i have had a FOAF profile since 2003. now it is finally useful for something.
Google, as usual, is not far behind. But they are taking a much different and more open approach to the social graph. Today they are launching the Social Graph API, which will allow third parties to grab social graph data that is produced by every day activities across the web – linking. Who you are (defined by Flickr, blogs, Twitter and other web services) and who you know, can be determined by data included with links, or in other data included on web pages but not shown in a browser. The 2 standards around this, XFN and FOAF, provide explicit and public data to Google (and anyone else that looks) on who you are and who you know. Technically this is pretty simple stuff. Links may contain XFN tags to state a a relationship, such as “me” or “friend.” These are explicit, public statements of relationships and are built in to many web applications, or can simply be added by humans.
bradfitz++

