Online and in the news, the word "disinformation" appears often, but what does it mean, and how can it be combated? This book explores the most common usage of the term disinformation, the intentional spread of false information for political means, and provides guidance for how to spot it online, with special attention paid to its propagation through social media platforms such as Facebook and Twitter. With colorful photographs and sidebars about the role of social media, sock puppet accounts, and bots, readers learn about media literacy and how to read sources with a critical eye.