Yeah, the problem is that a lot of those are effectively dead, subsumed by Reddit and Facebook.
I've sometimes dug up still existing sites from the 2000s I used to visit, and the results are typically depressing. Such as:
* Site still exists, but is terribly broken. Doesn't render, uses now incompatible SSL, or something. It's a forgotten server in somebody's closet, still chugging, but not being maintained, so whatever remains will probably vanish whenever the disk/PSU/etc fails.
* Last posts from 2015, mostly with "gee, it's kind of dead in here, anyone still around?" comments at the end of threads.
* Discussion is down to 5 people that post once a month, and there's also a thread with obituaries for past well known members.