This.

The old forums are often still up, and there are still actual humans there, sometimes. But nobody goes there, because nothing's happening there.

There was this programming forum (blitzforum.de) that I loved when I was a teenager. I spent so much time there and learned so much. I actually attribute a lot of my career to getting an early start there. But the forum is mostly dead nowadays. People still open the page every once in a while, but nobody posts there.