In the days after Elon Musk took over Twitter in October 2022, the social media platform saw a "surge in hateful conduct," which its then safety chief put down to a "focused, short-term trolling campaign." New research suggests that when it comes to antisemitism, it was anything but. Rather, antisemitic tweets have more than doubled over the months since Musk took charge, according to research that I and colleagues at tech firm CASM Technology and the Institute for Strategic Dialogue think tank conducted. Between June and Oct. 26, 2022, the day before Twitter's acquisition by Musk, there was a weekly...