Elon Musk promoted himself from avid Twitter user to major stakeholder on Monday. Musk, the head of Tesla and SpaceX, who has over 80 million followers on the platform, now also owns a 9.2 percent stake in Twitter, making him the company’s largest shareholder. And by the time the company announced his appointment to the board on Tuesday, the internet was already speculating about the kinds of changes that Musk could influence. “He can make recommendations at the board meetings, but what he really has is soft power,” the tech reporter Casey Newton tells Kara Swisher. In this conversation, Kara and Newton debrief how Musk’s infamy will contribute to his presence at Twitter. They discuss the possibility of an edit button on the site, as well as how Musk’s relationship with the C.E.O., Parag Agrawal, and the co-founder Jack Dorsey might affect the direction of the company. And they talk about whether Musk will push for Twitter to replatform Donald Trump. You can find transcripts (posted midday) and more information for all episodes at nytimes.com/sway, and you can find Kara on Twitter @karaswisher.