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.
Mark Zuckerberg is a great influencer as long as global economy is concerned. If he wants to diversify his business to cryptocurrency and the blockchain, then it is a welcome development.