In the nearly three years since Musk acquired Twitter, the social-media platform has endured mass firings; an advertiser exodus; and, of late, antisemitic posts by its AI chatbot, Grok.

The abrupt resignation of X CEO Linda Yaccarino calls into question the fate of the world's largest and most politically relevant real-time social discourse platform. Why it matters: Yaccarino was hired to rehabilitate X's ad business and bring stability to the company,