This edition of Reference Shelf looks at propaganda and misinformation. Social media posts inciting sectarian violence, government-manipulated misinformation campaigns, for-profit fake news headlines, and well-meaning but gullible individuals promoting conspiracies point up the problems with our current media environment. Looking at such issues as Russian election interference, the increasing polarization of media consumption, hacktivism, and the future role AI could play in making fake news more difficult to detect, this volume explores the pollution of our information environment and what we can do about it.