Trying to wrap my head around webfinger..
my first thoughts about it were that a subject of acct:firstname.lastname@example.org would have a listing of rel’s for the different accounts that are related to me (ie. yarn, salty, twitter, mastodon, etc…)
but maybe my thinking is at the wrong level.. that each of those accounts would be on a subject level and the rels are describing different aspects of that account. so i would have salty:acct:email@example.com, twitter:acct:xuu, mastodon:acct:firstname.lastname@example.org, yarn:acct:email@example.com and then i could have a main acct:firstname.lastname@example.org that links them together as aliases.
I found okta will do something similar with its accounts to show as okta:acct:user@domain so maybe I am on to something?