I miss guestbooks. No context, no social media BS, just "say hi or something." I think the first server-side script I ever wrote was possibly the worst guestbook ever in perl on Tripod.
All webrings were missing was a HUD. A top-down topographical map of the ring and an indicator of your position in it at any given point would have been awesome.
I almost half think there must be a way to bring them back, but I keep coming around to yet another js widgety social media service thing which would probably just wind up evil.
And people wouldn't even use it because it would probably break their SEO or something. But "I like this site - show me another one like it, but make it go in a circle" seems like an idea that should be able to get traction even now.
I actually considered building a web ring service just for tumblr when it was beginning to get popular. What's old is new again tends to repeat over and over again.
And webrings. Oh god webrings...