Twitter/X CEO Linda Yaccarino lasted two years at her job before announcing her departure. Running an ad business for Elon Musk was an impossible job.

Linda Yaccarino, CEO of Elon Musk’s social media site X, is leaving the company.

In just under three years since Musk acquired the social-media platform then known as Twitter, it has seen mass firings of its staff, an advertiser exodus and now the abrupt departure of its chief ex...