Restaurant operator KFC said Monday it filed a lawsuit against three companies in China whose social media accounts spread false claims about its food, including that its chickens have eight legs. The case filed by China's biggest restaurant operator comes as the government intensifies a campaign to clean up rumors on social media. Internet marketers have been convicted of trying to manipulate online sentiment on behalf of clients by posting false information about competitors or deleting critical posts. In an announcement posted on its Chinese website, KFC said one of the best-known fake rumors was that chickens used by the...