USA: „The way adolescents socialize has fundamentally shifted, moving toward online activities and away from face-to-face social interaction. Other activities that typically do not involve screens have also declined: Adolescents spent less time attending religious services, less time reading books and magazines, and (perhaps most crucially) less time sleeping. These declines are not due to time spent on homework, which has declined or stayed the same.“
Univ.-Prof. Dr. John F. Helliwell u.a., World Happiness Report 2019 (2019), S. 90.