When I link to another blog or site that has enabled webmention, my server log should record that it received a 20* response when trying to reach a webmention end point.
Assuming this is indeed in my server log, then it should be possible to have a script that pulls the successful webmentions from the server log. From that a growing list of IndieWeb sites can grow. Especially if you’d share that list, and others do too, so you can compare and detect new additions to the list. An incremental way of mapping the IndieWeb. Might even become a new, indie Technorati of sorts. At the very least it’s a discovery vehicle to find others interested in the distributed web and outside the silos and media sites.
Or does something like that already exist?