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Usenet
alt.atheism
what is that?
Not sure if serious. 😑
Anyway, before forums, there was a network of servers hosting discussions and to some extent file sharing.
The modern version of Usenet is pretty focused on file sharing and mostly so on paid servers.
https://en.m.wikipedia.org/wiki/Usenet#:~:text=Usenet is a set of,which is potentially widely distributed.