Elon Musk’s recent investment in Twitter has turned a high-profile and frequent user of the platform into the company’s largest stakeholder.At 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’s fate has suddenly become much harder to predict.Guest: Mike Isaac, a technology correspondent for The New York Times.Want more from The Daily? For one big idea on the news each week from our team, subscribe to our newsletter. Background reading: Twitter has survived founder infighting, boardroom revolts and outside shareholder ire, but Mr. Musk is an activist investor unlike any other.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.  Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify. You can also subscribe via your favorite podcast app here https://www.nytimes.com/activate-access/audio?source=podcatcher. For more podcasts and narrated articles, download The New York Times app at nytimes.com/app.