It was long awaited, and some doubted that it would ever come to pass, but last week, the tech billionaire Elon Musk officially took over Twitter.The platform was once the place of underdogs, a public square that allowed users to challenge the moneyed and powerful. Is that about to change?Guest: Kevin Roose, a technology columnist for The New York Times, and co-host of the Times podcast “Hard Fork.”Background reading: A decade ago, Twitter was a tool for rebels and those challenging authority. But over time, the powerful learned how to use it for their own goals.Mr. Musk and a group of his advisers have been meeting with company executives, working on layoffs, ordering up product changes, talking with advertisers and reviewing content moderation policies.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.