alt Hacker NewsSome FidoNet boards did, actually! The FidoNet boards near me all carried "regional" forums / echoes that were available only within the regional network itself. I was actually way more active on those forums than the global ones.
(By "active", I mainly mean participating in flame wars. If any of those sysops are reading, I do apologize for the behavior of my teenage self.)
Sure, in the same sense that there is an /r/chicago on Reddit. :)
The huge win to hooking your BBS up to a FidoNet (or the FidoNet) was that you'd immediately be having conversations with people all over the country.