Orkut is certainly the most anti-social of anti-social networks. Profiles are not visible without logging in, there are no rss feeds in or out, and they seldom even bother to post any news (much less server status reports).
orkut - communities
Invited some people to orkut and was surprised by how quickly it was running. Poked around a bit more and it turns out that all of the communites have no topics or events. That's one way to have a snappy anti-social network ...