NPR: 

This past summer and fall, thousands of Facebook accounts started posting about U.S. politics and foreign affairs. But their posts were weird — some included what looked like Twitter handles and the term “RT,” an abbreviation for “retweet.”When Facebook’s parent company, Meta, started digging into them, it found that the accounts were copying posts from Twitter, now known as X, and pasting them onto Facebook. The accounts were pretty obviously fake: While they claimed to belong to Americans, Meta found they were being operated from China, with stolen names and profile pictures.