A video promoted by President Trump and viewed by millions of people touts a cure for the coronavirus that is disputed by every reputable medical establishment. Social media outlets are now flagging the president’s messages and other sources that pass on false information. But that doesn’t stop a large number of people from accepting false and unproven information as fact, especially when it reinforces existing beliefs. Social media is awash in misinformation, conspiracy theories and memes that contradict established evidence. As we do periodically, we’re checking in with media literacy experts about how to recognize reliable—and unreliable—sources in the constant stream of available information.