@sononick I don't know. I only know what I'd like and that's the option to not talk to people from high school or my Dad's weird extended relatives who always try to contact me. I think Tumblr / Twitter are like that, mostly.
I think if they're trying to compete with Facebook, they should get more directly involved with the general community and -- while not necessarily letting them vote features into existence -- should really focus on the interface for everything. That's the interface for the users and the poor, sad web developers (like me) who have to fix their crap every day because something else breaks.
If it's going to be as ubiquitous as Facebook, I'd prefer they go the Apple route -- do a handful of things really well.
What the next great site will be, I don't know, but this isn't it. This is a failure on the way to success, but God bless their hearts for trying.
Also, I don't like how your face is always judging me. "Is that really what you want to say to me?" it asks. "Yes?" I respond with significantly less confidence.