iGen: Why Today's Super-Connected Kids Are Growing Up Less Rebellious, More Tolerant, Less Happy--and Completely Unprepared for Adulthood--and What That Means for the Rest of Us

by Jean M. Twenge

experiments that randomly assign people to experience more or less screen time and those that track behavior over time have both found that more screen time causes more anxiety, depression, loneliness, and less emotional connection. It seems clear that at least some of the sudden and large increase in depression has been caused by teens spending more time with screens.