It is mildly interesting from a technical perspective but doesn't really add much to what I can do today. (Not to mention it's been down and/or slow under the load lately). Perhaps the only real draw is that "everyone" is on there - but we all know love for social networks can be fleeting (see, e.g., Friendster, Facebook). As Yogi classically put it, "nobody goes there anymore; it's too crowded."
At this point, yet another network doesn't excite me. What would excite me? Aggregation of my networks, identities and connections. I guess I'm really just looking for the Trillian of social networks. (There are people out there trying to do this, but I haven't found any that seem to do it really well. Feel free to leave a link if you know of or run one of these sites).
Of course, we all know what this is really about. Damn cats.