It is important to consider that while this trend also affects adults, it is particularly worrisome for teens because their brain development is ongoing and adolescence is a crucial time for developing social skills.
Are smartphones really making our children sad?

US psychologist Jean Twenge, who has claimed that social media is having a malign affect on the young, answers critics who accuse her of crying wolf
Fuente: Ian Tucker - The Guardian, 13 August 2017.
Fuente: Ian Tucker - The Guardian, 13 August 2017.