I hope this community continues for a long time. A similar one I was involved with was ukriversguidebook. It's still up, but barely gets any posts anymore. It was a forum for collecting river guides and information as well as a phpbb for discussing kayaking and canoeing. I used to read it every day and contribute guides sometimes, but this kind of thing has all gone to Facebook which is ok for transitory discussions but doesn't work as a historical document for discussions or information.

Incidentally after all the furore on here I'd assume reddit was largely dead now, but since starting playing console games this year I've realised how heavily used it is for gaming tips.

https://discuss.bootstrapped.fm - a forum for small internet business owners. we still have the archive tho!

Dont howl over the joys that were; fire up a forum and make those joys live again.

2go. It was amazing. Miss it a lot

Ffffound.com Salon.com WebMonkey (the one from the 90s) CBCRadio3 Rdio Anandtech Twitter

Revue, i started a newsletter and was 17 weeks in, then Elon took over Twitter and shut it down

Not so much an answer to your question, as the sites are still around, more than what made the sites enjoyable is gone.

OSNews - while Thom does well, there’s just not as much great content anymore, nor discussions.

Reddit/Slashdot - I think so many of these discussion sites died once Trump and MAGA came around, a bit of it started back with the Tea Party crazies too. So many discussions get overtaken by crazy political posts.

DeviantArt - I used to enjoy that site, now it’s just filled with AI crap.

I used to subscribe to a magazine called Computer Arts. They had a section where they showcased sites with amazing design and UX, lots of Flash fun. That died with Flash and every site being designed around a layout that allows the most ads that can be placed on it.

Long form content sites died too, or are hidden behind paywalls. Surfing the web just isn’t enjoyable anymore.

Geocities.

I am obliged to mention Dark Sky - purchased by Apple and deatomized. They supposedly rolled some of its data into the default _OS weather apps but it doesn't feel the same and the UI is completely gone, which imo was the best part. (Plus I primarily use Android.) I used to go everywhere by bicycle and the ability to know at a glance precisely if and when it was going to rain was invaluable.

The latest default weather from Google in Android (might only be Pixel?) is actually a decent substitute for the basics, although it's still not as reliable and well-thought-out as Dark Sky was.

Orkut, a real social network that connected us to friends and family, before the newsfeed ruined everything

Groklaw.

Easily, Fucked Company tops the list for me. Never has there ever been a more entertaining website. But also it was like staring into an abyss.

Bookdepository

explicit word that may displease amazon fanboys amazon!

digg and stumbleupon

fuckedcompany.com Layoffs are back. Time to fire it up.