It seems like the FB founder has nothing but positive things to say about blockchain technology.
There are rumours going around that he will release a cryptocurrency for use on WhatsApp, but given the privacy and censorship concerns over FB, I can't see many people going for it.
Dude, the average person is not your average crypto enthusiast. If that were the case Steemit would be more popular than Facebook. If FB push a coin to the masses it could easily overtake the entire crypto market combined.