Elon Musk’s Twitter Teeters on the Edge After Another 1,200 Leave

Elon Musk sent a flurry of emails to Twitter employees on Friday morning with a plea.

“Anyone who actually writes software, please report to the 10th floor at 2 p.m. today,” he wrote in a two-paragraph message, which was viewed by The New York Times. “Thanks, Elon.”

About 30 minutes later, Mr. Musk sent another email saying he wanted to learn about Twitter’s “tech stack,” a term used to describe a company’s software and related systems. Then in another email, he asked some people to fly to Twitter’s headquarters in San Francisco to meet in person.

Twitter is teetering on the edge as Mr. Musk remakes the company after buying it for $44 billion last month. The billionaire has pushed relentlessly to put his imprint on the social media service, slashing 50 percent of its work force, firing dissenters, pursuing new subscription products and delivering a harsh message that the company needs to shape up or it will face bankruptcy.