Heavy users of social media are at risk, especially in English-speaking countries and Western Europe. In North America and Western Europe, young people are much less happy than 15 years ago. Over the same period, social media use has greatly increased. Many people blame social media for this fall in happiness, but does this hypothesis stand the test of rigorous scientific analysis? What about the rest of the world, where young people’s happiness has not declined relative to adults, even though social media is equally prevalent? There has been much research on this topic. This report does not attempt a comprehensive synthesis of the academic literature – for that, we refer you to the studies listed at the end of this chapter.1 Instead, we started by asking two leading critics of social media, Jonathan Haidt and Zach Rausch, to lay out their case (see Chapter 3). They offer two main types of analysis. First, they report what young people, their parents, their teachers, and employe...