What are they? Who makes them? And above all, what for? Every day on social media we see images and video that have been manipulated, we find conspiracy theories, deepfakes, and bots that try to trick us. And if that weren’t enough, without even meaning to, we can get dragged into a chaos of disinformation if we lack the necessary tools distinguish what is truth and what is lies. But what if avoiding getting our leg pulled is easier than we thought? This entertaining and rigorous manual will help us learn how to fact-check information and turn us all into genuine lie detectors.