A rules-based procedure for making calculations or solving problems. Algorithms are everywhere in computer science and are crucial to the software that runs the world. In social media, the most important algorithms are those that determine which content we see. For example, your Facebook News Feed doesn’t show every status update and every photo from every one of your friends. Instead, it displays an algorithmically curated set of content that Facebook thinks is most worth seeing. Similarly, Twitter, Facebook, and Google Plus use algorithms to define which topics and hashtags are currently trending.