As an individual person I would have twitted about bitcoin, its uses to my followers and informed audience why today we need decentralized system completely out of control of banks and money printing mafia. I would write a article per month or once in 2 months. However interfering it with twitter is not that easy, twitter need to follow law of land and still btc is banned in many countries. Also morally it should not be right to use twitter for my personal opinion unless board decide to do it.
Anyway Jack is already doing many things for crypto adoption, recently square capital invested millions in it.