M eta Platforms Inc. said it removed a China-based network of more than 500 Facebook accounts that sought to push a false narrative about the U.S. government’s attempts to blame the Covid-19 pandemic on China. The campaign involved the fake persona of a Swiss biologist named Wilson Edwards, who in July posted on Facebook and Twitter Inc. that the U.S. was pressuring World Health Organization scientists to blame the virus on China, according to Meta’s monthly report on coordinated influence operations on its social networks. Within days of the first post, hundreds of social media accounts and a handful of...