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.
Zuckerberg is tech savvy and similar to a monopolist, he will certainly be monitoring the cryptocurency market got a better entry point. And just like every other foresighted business man, he will have a shot