Two notes:
- we are social animals so we like to interact and depending on where we live and how we live finding similar cohorts of people in desired quantities it's not that easy without some form of telecommunication. Banal example: I like computers, classic desktop systems, Emacs, zsh etc even in a CS faculty I was able to find only a very small cohort of people with a similar "hobby", I like to climb, again finding other climbers is not such hard but also not that immediate, it's not that popular. I like offroad, shooting, downhill MTB, Ski-Alp. All such sports are not that common, finding people with similar interests it's easier with a bigger agorà (like internet, with usenet or the web);
- MODERN social networks have replaced older ones with a far different target: older ones have a simple target, matching people, making them communicate on common areas of interest. Modern ones have the target to profile, project and direct people discussions, isolating, matching some but not others etc. Witch means modern social targets are political and economical AGAINST their users, exploiting their characteristics.
The result is that in modern era people are hyper-connected to someone else computer system, but also hyper-isolated humanly. And that's not a side effect but a target. You can steer even an entire civilization without most noticing or even knowing who you are mastering social interactions.