USA: „The rise of digital media and the fall of everything else over the last decade, the amount of time adolescents spend on screen activities (especially digital media such as gaming, social media, texting, and time online) has steadily increased, accelerating after 2012 after the majority of Americans owned smartphones. By 2017, the average 12th grader (17-18 years old) spent more than 6 hours a day of leisure time on just three digital media activities (internet, social media, and texting). By 2018, 95 % of United States adolescents had access to a smartphone, and 45% said they were online ‚almost constantly‘.“
Univ.-Prof. Dr. John F. Helliwell u.a., World Happiness Report 2019 (2019), S. 90.