So he's how social network portability (take one) works: "we crawl the Web to find publicly declared relationships between people's accounts, just like Google crawls the Web for links between pages. But instead of returning links to HTML documents, the API returns JSON data structures representing the social relationships we discovered from all the XFN and FOAF. When a user signs up for your app, you can use the API to remind them who they've said they're friends with on other sites and ask them if they want to be friends on your new site." It depends on sites publishing FOAF or XFN. Oops, they're not doing that. But (maybe) they will. Here's the docs and here's the code. Related: OpenID2 becomes even more important, from Marc Canter. And Andy Powell on XRI and OpenID (which I don't really support). And Ross Dawson says data portability will vastly increase the value of the net to users. Finally, Brian Kelly on standards for data portability.