Generations: The Real Differences Between Gen Z, Millennials, Gen X, Boomers, and Silents—and What They Mean for America's Future

by Jean M. Twenge

TV time is only weakly linked to unhappiness, and gaming (which is more popular among boys) is pretty much a wash until it reaches 5 hours a day. But unhappiness starts to trend upward after just an hour a day of social media use for girls.