A systematic review: the influence of social media on depression, anxiety and psychological distress in adolescents 
 

Highlights

Participants aged 13-18
There are many contributory factors to mental health & social media, but there is a link
There is a general correlation between mental health impacts and social media use
Attitudes and behaviors may impact this more than the amount of time spent on social media
Social comparison between youth
What are their motives to use social media (distraction, etc.)

https://doi.org/10.1080/02673843.2019.1590851