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Elon Musk\u2019s recent investment in Twitter has turned a high-profile and frequent user of the platform into the company\u2019s largest stakeholder.\n\nAt first, the involvement of Mr. Musk, the C.E.O. of Tesla, was seen by the social media giant as a chance to gain a powerful ally. Instead, Twitter\u2019s fate has suddenly become much harder to predict.\n\nGuest: Mike Isaac, a technology correspondent for The New York Times.