WHAT WILL he do with it? That was the big question after Elon Musk let it be known on April 4th that he had amassed a stake of 9.2% in Twitter, making him the social-media firm’s largest shareholder. Will the world’s richest man buy more shares or even take Twitter private? Will the boss of Tesla take a hands-on role in Twitter’s management? Will the libertarian troll push to bring back Donald Trump, kicked off the platform after…