YiffChat has 34 rooms as of 3 March 2007.
Closed down in 2007 after disagreement between Toumal and several MUCK wizards over Muck ownership.
Off-topic content is not made relevant by the title or any added text.
Floof City Invite Link: Floof city is a welcome discord community, with a population of over 2,000 members from around the world.
If anything, do yourself a favor and give it a wing.
You can even message the owners of the server directly, which is a feature that not many servers offer.