The actual anniversary occurred in May of this year, as noted in the Fediverse toot from which I'm adapting the title for clarity:

<https://tilde.zone/@daveshea/110337299027050269>

I've distinct memories of the site at the time and how absolutely revelatory it was.

Previous HN discussion at 10:

<https://news.ycombinator.com/item?id=5669601>