buc.ci is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
I guess I'll be doing some insulating. This is the longest, coldest cold snap I've experienced here and the bright side of it is that it's alerted me to a trouble spot as well as the limits of our current systems!