[Terretta]

Saw no mentions here of “Talkers”, the very early 90s precursor to Discord or Slack.

The early talkers were similar to MUDs with most of the complex game machinery stripped away, leaving just the communication level commands – hence the name "talker".

https://h2g2.com/edited_entry/A1010106

Early Talkers included Cheeseplant’s House, Elsewhere, Surfers (ewtoo), Foothills, Tower, Resort. World, etc.

Some are still online, here: http://list.ewtoo.org/

I just tried one — login worked, last logged in April 2003. That means that site has been online ~30 years.