I have been reading, with great interest, The Anxious Generation by Jonathan Haidt. The central thesis of his excellent book is that the mental health of adolescents in many western countries deteriorated suddenly and rapidly between 10 and 15 years ago. Haidt contends that this has been caused by the decline of free play in childhood and the rise of smart phone use in teenagers.
Haidt shares the story of Alexis, an 11 year old girl who opened an Instagram account by stating that she was 13. Alexis downloaded the app, used it for a while and deleted it so that her parents would not see it. She learnt how to hide the app on her home screen rather than go to the trouble of deleting it. When her disapproving parents found out that she was using Instagram, Alexis made secondary accounts which allowed her to post without their knowledge.