https://www.slashgear.com/study-extreme-internet-use-among-teens-may-be-harmful-to-mental-health-03490497/

While moderate usage among kids and teens resulted in 6.7% saying they were experiencing bullying online, 17.8% of ‘extreme’ users reported having the same bullying experience. As well, extreme youthful Internet users reported having lower life satisfaction than those who use it moderately or less, rating their life satisfaction at only 6.59/10 (versus a moderate user’s 7.4/10). Of course, this doesn’t mean that social media and Internet are inherently harmful — the study notes many benefits that both provide.