[welcome_dragon]

So webrings?

[camtarn]

Sort of, but webrings needed the site owner's involvement and couldn't have new links added by people just viewing the website.

[tootie]

Exactly my thought. Maybe an idea worth dusting off. Web rings were a thing when search barely worked.

https://en.wikipedia.org/wiki/Webring

[jerf]

No, those have very different characteristics. This is a variant on annotation.