If, say hypothetically, in whatsoever way, Facebook forces its users to pay for its services, some of them will sure.ly stop using it. This, certain.ly will start a chain reaction, and slow down the Facebook, inevitably depriving the portal of its charm and appeal. A loss of 10% is a guarantee with a loss of 50% very like.ly.
I guess this is the way the big guys behind Facebook see the future and are preparing IPO indeed to recycle whatever they can.
If you ask me, I am not investing in the venture.
Short link: http://➸.ws/~Vvc$l