One thing "man" has always found difficult to adapt to is change. Especially when a service has run successfully for many years without any stiff competition. Monopoly in short. But feels threatened by another phase on the horizon. You sure want to step up your game.
A paradigm shift is unfolding. The next phase has surely got Zuckeburg's attention. There is only so much facebook can hand over to us because of its blueprint.
On the other hand censorship is a ticket that facebook will still like to hold on to. Zuckerberg is just trying to look for his next level of success.