As others have mentioned, the decline started long before social media and the Internet. When I was a child, in the 70s, my parents often had other families and couples over for dinner, and we often attended small dinner parties, too.

As an introvert, I absolutely loathed these gatherings and was frustrated by how powerless I was in avoiding them.

Recently, I have been reading over my mother's old letters she wrote to her parents at that time, in which she described the effort and social anxiety that went with this tradition. It was not something my parents enjoyed, but rather an obligation they felt they had to uphold. Someone invites you over, then that goes into an unspoken balance sheet, and you are required to reciprocate. She often spoke of "owing" dinner to people. I don't think she enjoyed it at all, though there were a few couples I can remember who were good friends of theirs, and those meetups were always a pleasure to listen in on. The rest were simply a drag.

I should note that their life in the 70s (in a middle-class college town) was not some idyllic paradise without the Internet, either. Everyone was constantly falling ill with colds or flu, and days were spent running dreary errands to shop for boring things that we now can get with a click. The rotary-dial telephone that hung in the kitchen was the heartbeat of the house, since replaced by Facebook and smartphones. My parents were always busy and exhausted.

Back in the 80s/90s, when my grandma was alive, we used to have big holiday dinners for the whole big family (I think in total of 10+ people) in her small apartment (about 20 m^2, perhaps even less). It was extremely crowdy and some people used to eat standing outside and chat with each other. But it was also one of my best memories.

30+ years forward, I moved to a new country, and we only have one kid. We haven't had this kind of big dinner for decades since my grandma passed away in the late 90s.

The families are getting smaller and more atomized, so only people who are VERY into big dinners throw them.

> Everyone was constantly falling ill with colds or flu

That’s just anyone who has small kids. Or works in healthcare, childcare, or any service industry really. It has nothing to do with 1975 vs 2025 (unless you’re one of the small amount of people who work remotely, and you don’t have kids or a spouse who falls into one of the above categories).

Also after a few years you stop getting so many colds.

There also used to be pretty strong social expectations to host and visit such parties. That was essentially gone by like 1990, for my area, and I always kind of got the feel that everyone was glad to see the expectation disappear.

All of that sounds many times better than just being alone without a community.