Opening yourself up to Twitter is a risky business at the best of times. But when you’re a recently elected South African political leader dealing with one of the most cynical Twitter communities on the planet, then things can go very badly wrong. That’s the lesson DA leader Mmusi Maimane’s had to find out the hard way today. Viewed by many as the opposition party’s attempt to replicate the rapid rise of Barack Obama, Maimane is also seen by some to be an empty vessel for other political interests.