It’s not just social media though. It’s all media. And some would argue that it is tech itself that is causing it. For example, the shift from viewing “TV” (including movies, etc) together with other people to watching it on your own device with headphones (earbuds, speaker, etc) is a very large behavioral change. I can witness it in my own family. We had “movie nights” all the time where we would gather around on the sofas/chairs/floor and watch a movie together. And we all took breaks at the same time, if the majority agreed that it was time to make popcorn, we would pause the movie, I would get the popcorn pot out and make popcorn. That was a break of perhaps 10 minutes that we all took together. Some of us would go to the bathroom briefly, some would grab another snack, some would help make the popcorn, etc. But often during that time we would discuss the movie so far and perhaps guess what comes next. Today? Everyone, including me, watches on our own device at our own pace with our own snacks, no discussion until perhaps much later, if at all. Now, part of it is all the kids becoming big teens and adults, but still I remember in my family as a kid and young adult we would gather round the VCR player and watch the movie that we got from Blockbuster together.
Same for travel. In any mode of travel today, people entertain themselves with earbuds in (mostly) and using personal devices. Twenty years ago? People would perhaps do other things alone, but sometimes would talk to their seat neighbor. And on a plane, everyone watched the same movie on those pop-down screens, and sometimes may have discussed it. Or at least reacted to it together.
Finally, when it comes to travel, people do solitary drives MUCH more often today than in previous generations. And again, on a solitary drive, you are alone, nobody to interact with.
And when it comes to children? Parents are absurdly afraid to let their kids out of the house, so they stay inside most of the time. And because parents are busy, those kids are … on devices most of the time. If the primary effect is lack of socializing, the secondary effect is reduced health from all the sitting around instead of moving around. When I was a kid, the first thing I wanted to do when I got home from school was to get on my bike and go meet friends somewhere to “do stuff”. Nowadays, the first thing a kid wants to do when they get home from school is to get on their device and catch up on minecraft or watch a series of cool tikpik videos … because they weren’t allowed to do it at school.
And it’s not just kids, it’s everyone. Even me, and my 80+ year old parents, spend way too much time on connected devices simply whiling away the time on what passes for “entertainment”. Or even semi-creative stuff like word games or number games. Yes, those are good for the aging brain, but so is socialization good for the aging brain, and you need a combination of both.