Is Elon Musk bored of the town square already? A month after completing his acquisition of Twitter, his iconoclastic gaze appears to be trained on the entire city. Mr Musk wants to build a super-app. Whether called “Twitter 2.0", “The everything app" or “X", his plans are still super-vague. A series of slides containing hardly any information tweeted on November 26th did little to shed light on his plans. Doting references to Tencent’s WeChat provide some clues—earlier this year Mr Musk described the Chinese super-app as “Twitter, plus PayPal, plus a whole bunch of other things, and all rolled into...