Gah!  This brings back half forgotten memories.  I was a RingMaster on both Webring.org and Ringsurf.  Plus I actually ran a Science Fiction/Fantasy webring hosting site via a nice free Perl script for a few years.  I never thought in my wildest imaginings that somebody would revive the webring concept, but it fits with the theme of the Indieweb movement.  (BTW: Ringsurf appears to be still around but I have no idea how it works today.)