Chatrooms as a concept are much older than the 1990s. I used chat rooms on the university's CDC mainframe in the late 1980s, with a system called 'confer.' Peop

Chatrooms as a concept are much older than the 1990s. I used chat rooms on the university's CDC mainframe in the late 1980s, with a system called 'confer.' People would sometimes create private rooms for online sex talk. Minitel supported chat rooms, including for adult chats ('messageries roses') in the 1980s. CompuServe an innumerable BBSes also had chat rooms in the 1980s. And the PLATO educational system had chat rooms in the 1970s. See https://en.wikipedia.org/wiki/Talkomatic https://en.wikipedia.org/wiki/Talkomatic . However, you limited this to chatrooms implemented with 'web technologies' - I can't address that specific topic.