One thing we should know about this companies like facebook and twitter is that what have kept them in the top is the ability to see a new technology and embrace it in other to improve their platform and getting more people on-board, they know that blockchain is the technology of the future and they are not ready to miss out of it because if they miss out, in few years to come they might not be relevant as they are now in the society and world at large.
Merchants and corporate giants first may adopt blockchain technology which might move toward bitcoin over the course of time for sure. I mean now facebook, twitter and JP morgon kind of big corporate are announcing having their own blokchain based coins and this may help spreading awareness on cryptos which will end up in mass adoption and then main stream hitting.