„The World Happiness Report 2019 found that US teenagers who spend long hours browsing through social media and using their smartphones are significantly less happy than previous generations. In addition, those who spend more time on the Internet were more likely to develop depressive syndromes than those who spend more time with their families and socialising with their peers instead.“
OECD (Hrsg.), „PISA 2018 Results. What School Life Means for Students’ Lives“ (2019), S. 164