Which is your favorite Social Networking site and why?

I also belong to Orkut, Myspace and Facebook, buts its difficult to find the time to update them and get involved properly. I like Orkut probarly the best at the moment although I also enjoy MySpace, but Facebook, at the moment I just can't get into, I just don't get that one. I have just joined xt3.com, which will proberly be my favourite, I would think, its new and relevent and promises so much. The forums on their also look good as well.

I am a member in a few including orkut. But I do not know how to interact and what for. Some how I'm managing at myLot due to its unique, flexible and impersonal posting features.