First semester of college, I stopped using Twitter. My sleep got better, I had more free time, and I was noticeably happier and freer. I no longer spent time in that dopamine cycle.
I've been weening off of Reddit and HN the past few months as well. YouTube is my next beast to conquer, and that might be the biggest one for me right now. I'm trying to adapt to longer form content again, instead of only watching videos under a minute or reading 280 character tweets. I want to have an attention span again, I really do.
Is social media an inherently evil thing? I don't think so, but I don't think I should use it. I also think that it can be toxic for teenagers in general. There are a variety of reasons, but the one that applied to me was the dopamine cycle caused by "likes".