Meta said it will begin testing fact-checking in the U.S. through Community Notes across Facebook, Instagram, and Threads on March 18 onwards and will use the open-source algorithm from rival Elon Musk's X as the basis of its rating system.

Meta revealed more details of Community Notes, and said that it incorporates the same open-source algorithm that powers X’s crowdsourced feature.

Meta will start testing its Community Notes model, with which it's replacing human fact checkers, on Facebook, Instagram and Threads in the US on March 18. Notes won't appear publicly on posts right away.