True, but that was because no one had social media. Now that a big majority of people have it and interact over it, if you don't have it the chances of being marginalized are higher.

When everyone was using SMSes to chat, how did the kid that did not have a phone felt? And people were social before phones existes too.

I think that being outside of the main mean of communication is going to have an impact on your social life, independently of what the medium is