I've been updating the social networking features on [tag]Rosebleed[/tag]. Most of the changes are not immediately visible, but they're nifty:
I've rolled out [tag]microformat[/tag] markup all over the site – user profiles are now [tag]hcard[/tag]-enabled and the friendslist is marked up with [tag]hCard+XFN[/tag].
I also implemented [tag]FOAF[/tag] profiles with autodiscovery, much like that provided by LiveJournal (for a cool FOAF tool, check out the FOAF Explorer).
Still in the works on the SN side is implementing [tag]OpenID[/tag] for logins and order tracking, and hCard, hCard+XFN and FOAF profile-pulling.