The Matrix but they use the Matrix protocol on a The Matrix themed Matrix IRC channel talking about talking about The Matrix in the Matrix protocol in a The Matrix themed Matrix IRC channel (woops sorry that is the Matrix 2 I think my bad)

Likely no

Wasn’t IRC itself pretty much federated, just maybe not calling it that yet? Networked I think they called it. You’d have a bunch of servers in a network and users could join channels and chat with users on other networks. Every now and then you’d get a server split where some subset of servers would lose connection with the rest and a bunch of people would all leave the channel at once. Then, it would resolve, and they’d come flooding back in.