I don't. I joined in June 2007, used it a lot for about 2 months, then mostly stopped, then stopped properly (I haven't logged in since October or November 2007).

It was amusing enough, but the amount of time I was wasting on it was out of all proportion to the actual value I was getting from it. I also didn't like the idea that I could be found by people that I didn't particularly want to resume contact with.