This Element explores misinformation as a challenge for democracies, using experiments from Germany, Italy, and the UK to assess the role of user-generated corrections on social media. A sample of more than 170,000 observations across a wide range of topics (COVID, climate change, 5G etc.) is used to test whether social corrections help reduce the perceived accuracy of false news and whether miscorrections decrease the credibility of true news. Corrections reduce the perceived accuracy of ...