In the last 24 hours alone, President Donald Trump has used his infamous Twitter account to retweet British fascists' anti-Islam videos and tag the wrong Theresa May in an angry rant. This is nothing new. The US president is one of the site's worst s**tposters - made infinitely worse by the fact that via virtue of his immense personal power, Trump's very bad tweets translate into almost immediate real-life consequences for everyone but him.