Before there were message boards, there was Usenet. On Usenet, there were thousands of groups about all kinds of things on an open and decentralized network. There were no administrators/moderators, but if you posted something that was against the agreed upon group "rules", you could expect to get "flamed" or "plonked" (added to people's blacklists).
Usenet is still around today, though most people associate it with Google Groups, which is just a front-end. During the heyday (mid to late 1990s), most ISP's would provide Usenet services and could be accessed with a client such as Outlook Express or [Free] Agent. Even AOL provided a Usenet service, resulting in what became Eternal September.
Before Usenet, there were BBS's, and anyone with a modem and the right software could host one, and while my family did host one for some time, they were generally before my time (plus we had to close our game of Mixed Up Mother Goose and start up the BBS software when someone wanted to dial in)
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"Tongue tied and twisted, just an earth-bound misfit, I" - Pink Floyd
(and then the tower cleared me for take off)