1. Internet penetration rate in Japan from. 2000 to 2020 [https://www.statista.com/statistics/255857/internet-penetration-in-japan/].
2. Share of people aged 17. to 19 years old who use social media platforms in Japan as of June 2020 [https://www.statista.com/statistics/1154797/japan-penetration-rate-of-social-media-among-young-people/].
3. Penetration rate of social media in China. from 2016 to 2022 [https://www.statista.com/statistics/234991/penetration-rate-of-social-media-in-china/].
4. Childhood. 2020: new independent report [http://www.childwise.co.uk/uploads/3/1/6/5/31656353/childwise_press_release_-_monitor_2020_-_immediate_release.pdf].
5. Social network user penetration in Germany from. 2018 to 2027 [https://www.statista.com/statistics/567322/predicted-social-network-user-penetration-rate-in-germany/].