The world's most successful entrepreneur now owns what he hopes will be Earth's digital town square, but he faces stiff head winds. He paid a very high price for the business at the top of the market, seems to have pissed off many employees, including senior management, as well as raised doubts among key advertisers. He's made his presence felt through mass sackings, a ban on working from home, a move towards a subscription service model whereby users pay $8 a month for the blue tick and foreshadowed a mayhem mode free for all. Can Musk weave his magic at Twitter or has he bitten off more than even he can chew?