XFN

 XFN  (XHTML Friends Network) is the network of visible links across blogs that claim various XFN relationships with/to each other. The name is a tongue-in-cheek self-deprecating parody of the "Psychic Friends Network".

IndieWeb Examples

 * publishes a blogroll with https://gmpg.org/xfn/11XFN rel values
 * Page is 404 as of 2020-02-22

Rel-me examples
Numerous examples of publishing and consuming XFN's rel=me value can be found on the rel-me page:
 * Browser Support (browser extensions)
 * Software Support (e.g. Mastodon, Pixelfed)
 * Service Support (e.g. micro.blog, indielogin.com)

Other Examples
Some older examples can be found on the microformats wiki:
 * http://microformats.org/wiki/xfn-hcard-supporting-friends-lists