X CEO Linda Yaccarino said she’s stepping down after two years running Elon Musk’s social media platform. Yaccarino posted a positive message Wednesday about her tenure at the company formerly known as Twitter and said “the best is yet to come as X enters a new chapter with” Musk’s artificial intelligence company xAI, maker of the chatbot Grok. Musk hired Yaccarino, a veteran ad executive, in May 2023 after buying Twitter for $44 billion in late 2022.