A president bound over to the Senate for impeachment yet who said not a word about it in his latest video. What really sent President Donald Trump ballistic in the words of a senior aide quoted by Politico was the decision by Twitter to block his output permanently. ETHAN ZUCKERMAN is associate professor of public policy and information at U Mass Amherst and he has studied social media since it was in diapers (nappies to you). What does it mean to “deplatform” a president, and where do his followers go from here?