For a window, it was really social, early to late 2000s (anyone in NL remember Hyves?). It was a great way for keeping up with friends as you went to different schools, when they were traveling, etc.

There were a bunch of things that destroyed it: Ajax [1], async tech made it possible to continuously push new dopamine shots when viewing a page; the rise of smartphones, since before smartphones you could only check social media when you were behind a computer, which was not true for most people most of the day; and the realization that dopamine shots + ads can bring in a lot of money.

Even though we had cell phones in the early 2000s, in most countries it was just for calling and some SMS (which was expensive outside the US). You would only go to Hyves, Myspace, or whatever when you had some time in the evening. I am sure some people got addicted, but it was much harder than having a device that tries to entice you all day to look.

That said, I still find social networks like Mastodon very useful. Not so much as a replacement for keeping up with friends/family, but it makes it very easy to discover what people who are in niches I'm interested in are up to. And since it does not have an algorithmic feed or ads, the addiction factor is much lower.

[1] https://en.wikipedia.org/wiki/Ajax_(programming)