The words "scale back to" are vague, but I'm struggling to think of any current global problems that weren't at least exacerbated by social media.

Then you need to think a little harder.

You have one thing on your mind - "social media bad" - and it is poisoning your ability to see the complexity in the world. There is rarely a single cause for anything, and there is never a single cause for everything.

"[G]lobal" is doing a lot of work in this sentence if I'm reading it as intended; this seems to exclude international conflict and intra-national strife (which are very big issues).