We didn't need social media before it existed. If no one's on it, that sounds like the ideal situation for young kids.
I remember a time around 2010 where I benefitted from social media, Facebook in particular. It wasn't addictive, I used it for 15 minutes at the end of the day to catch up with what foreign family was doing, we would organize real-life parties through Facebook, share photos of those events, tag each other. If you traveled internationally it was easy to keep in touch with people you met along the way.
I'm afraid we will never get to that point anymore but I do think there was a point in society where social media was a positive addition.
It has nothing to do with kids or social media.
Same thing with phones in school. When it's banned by a legislature, every kid's like this is actually great six months after being enacted.