yes back in the late 80's i owned a software company that wrote addons for a BBS system called the MajorBBS that was really one of the first true multi-user online systems available for the general public to own and deploy. the interesting thing was that, consistently, when sysops ran the numbers, online chat represented 85-95% of the use of these systems that allowed all sorts of other really cool things to do, in real-time, with other users.
the point of this is that facebook and twitter are really nothing more then personalized chat rooms, and looking back it isnt surprising at all that they represent the 800lb gorillas of the internet because, to be honest, it seems that all everyone really ever wanted to do online is chat (besides pr0n and "research" of course).
i think a facebook backlash is inevitable, like everyone hating nickleback or david guetta...i stopped using it except to get a hold of my kids about a year ago, and i enjoy letting people know i think its a total waste of time...now if i was younger i could see a lot more useful uses for it, like hooking up...but im sure Matt Smith isnt hurting along those lines.