Network effects are real. Financially independent adults can choose their friends among a large pool of candidates. Kids, broke college students, and those generally less well off may have fewer options.
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