@karengregory
My start was with discussion-focused BBS sites in Minneapolis that were networked (Citadel). Each had a distinct community flavor, even though most users had accounts on multiple sites and some discussion "rooms" were shared. There were Fido sites as well, but they tended to be more focused on software downloads and computer topics, not the casual chatting of Citadel.
Naturally I wound up running one.
@karengregory Offline meetups were common -- at restaurants, parties, even a cliff climbing campout.
Over time there was some limited integration with Usenet newsgroups and UUCP email.
At one point I counted 110 dialup BBSes in the toll-free phone service area.
The end of the restrictive Internet user policies and the sudden creation of dozens of local ISPs brought about the end of all that.