Usenet
Usenet is important in the networked world. Many well known ideas and terms were either created on usenet or made popular there. These include "FAQ", "flame", sockpuppet, and "spam".  In the early 1990s,  Usenet connections via Fidonet's dial-up BBS networks made it more common for people to discus things worldwide. They did not need a server, just (local) telephone service.