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.
I see no point in creating a Crypt for WhatsApp. About Blockchain, the trend is a wider use than just Cryptos so many people will still come to speak well of technology.