FOAF is not a fair comparison. It meets only the "open and distributed" criterion. A Facebook replacement would, like the Wave protocol, allow users to chose a

FOAF is not a fair comparison. It meets only the "open and distributed" criterion. A Facebook replacement would, like the Wave protocol, allow users to chose a service as their delegate, and would not just be a way for nerds to mark up their meatspace and online-only friends.