every activity that didn’t involve a screen was linked to more happiness, and every activity that involved a screen was linked to less happiness. The differences were considerable: Teens who spent more than five hours a day online were twice as likely to be unhappy as those who spent less than an hour a day.
In one experiment, people who were randomly assigned to give up Facebook for a week ended that time happier, less lonely and less depressed than those who continued to use Facebook. In another study, young adults required to give up Facebook for their jobs were happier than those who kept their accounts. In addition, several longitudinal studies show that screen time leads to unhappiness but unhappiness doesn’t lead to more screen time.
Somewhat surprisingly, we found that teens who didn’t use digital media at all were actually a little less happy than those who used digital media a little bit (less than an hour a day). Happiness was then steadily lower with more hours of use. Thus, the happiest teens were those who used digital media, but for a limited amount of time.