Yeah, no. People still talk to each other.
I leave it to you to exercise some adaptability and find suitable workarounds. This is a small problem. I guarantee you that you solve harder ones on a daily basis.
At Church on Sunday? No, that has collapsed.
At other social civic meetings... um, no not there.
Social gathering and civic interaction in the US has become highly commercialized and put into non-public places such as social media.
Check out your local recreation center. It's how I joined a local fencing club.
Check out meet ups in your area. It's how I join a language exchange group that meets weekly.
Check out your local library. They often have book clubs, kid and adult events, and more.
There are tons of options that people used before social media which still exist today. It's trivial to find them. The biggest problem is that many people don't want to move out from behind the screen.
Hospitality in general is struggling here. Pubs disappearing too.
Basically, find anything which interests you that places you in a context where you bump into the same group of people regularly. From that, connections with develop.
For many, the biggest challenge isn't finding a place to be but actually getting themselves out there in the first place.
What workarounds am I looking for? And for whom? Why aren't the people concerned looking for their own workarounds?
If you value convenience over the well-being of your children, you'll have a convenient life and children who are unwell.
Do what you think is best, but don't pretend it's impossible to live well without social media. It's laughable. It deserves snippiness.
Even if you have a teenager who is social at school and through extracurriculars, many meaningful social interactions are happening online or through social media.
For example, almost every team/club these days has a "group chat", where kids spend time bonding outside of practice / organized events. Even if your child shows up to every organized event, they still may feel isolated due to being excluded from the conversations happening outside of practices.
Also, social media is the predominant force that is shaping Gen-Z culture. Being excluded from such a large driver of your peer's culture can definitely create feelings of isolation. Imagine if you had grown up in a household where music wasn't allowed, and how that could have made conversations with your peers more difficult. And social media is a significantly bigger cultural force than music was when you were a kid.
These are just a couple of examples, if you'd like I can list more ways that social media is semi-necessary for many kids to avoid feeling excluded.
I'm not saying this is necessarily always a bad thing (there are definitely strong arguments to be made for abstaining from some elements of society), but I would make sure you're communicating with your child and that you understand their social situation.