I'm user #1483 on Slashdot. That still exists, and I hardly ever go there though. Before the Slashdot era, I don't remember having visited some particular site regularly to see updating content.

But, oh, I got one: http://suck.com. That stopped making new content in 2001, but existed for another 14 years. Now the domain seems to have been taken over.

https://en.wikipedia.org/wiki/Suck.com