Life evaluations among under 25s in the United States, Canada, Australia and New Zealand have dropped dramatically (by almost one point on a 0–10 scale) over the past decade, while the average for the young in the rest of the world has increased, according to Gallup World Poll data.

One international survey1 of 15-year-olds in nearly 50 countries suggests heavy social media use is associated, on average, with a significant drop in wellbeing among the students surveyed, though any effect is highly dependent on the type of social media platform being used, how it is used, as well as demographic factors such as gender and socio-economic status.

Other factors, such as social connections and a sense of belonging, are associated with much bigger changes in how respondents feel about their lives.