Elon Musk's Twitter rebrand suggests that he's "totally out of his element," says Harvard leadership expert Bill George. "If you had to write a case study on an example of a really poor takeover of an organization, Elon Musk's takeover of Twitter would fit that perfectly well," George, an executive fellow at Harvard Business School, leadership author and former CEO, tells CNBC Make It. "I don't think he understands social media." Musk announced his decision to abandon the 16-year-old Twitter brand Sunday, opting for the new name and logo, X. After acquiring the social platform for $44 billion last year,...