What is "misinformation"? Why does it matter? How does it spread on the internet, especially on social media platforms? What can we do to counteract the worst of its effects? Can we counteract its effects now that it is ubiquitous? These are the questions we answer in this book. We are living in an information age (specifically an "algorithmic age") which prioritizes information "quantity" over "quality". Social media has brought billions of people...