Since co-founder Jack Dorsey's resignation in November, Twitter has been led by a new CEO, Parag Agrawal, whose early moves have included internal reorganizations. There have been no major changes to Twitter, which has fewer users than social media rivals like Facebook and TikTok despite having out-sized impact thanks to high-profile celebrity and political posts, and a loyal community of journalists. Musk is a big user, with over 81 million followers on Twitter.