Meta first announced that it would retire its third-party fact-checking program in January. At the time, CEO Mark Zuckerberg said that the company would replace it with community

Mark Zuckerberg and Elon Musk were once poised to fight in a cage match in 2023, before Zuckerberg called it off, saying that Musk was "not serious." Now, the two billionaires have gone from the brink of battle to using each other's technology.

Meta will test Community Notes in the US starting March 18. This uses X's technology and allows users to flag false or misleading content. About 200,000 users have signed up to contribute. The system replaces third-party fact-checking with a crowd-sourced model.

Meta will begin one of the company's most significant overhauls ever for how it fact-checks information on its platforms. On March 18, Meta

Mark Zuckerberg and Elon Musk have something new in common: the algorithm for their platform's respective community notes.