I think IRC wins by being around the longest, but also being dead simple to set up and use.
I tried using Matrix and it just honestly frazzled my head a little. I know it’s just a few extra steps to get registered, but it honestly feels like a few extra bits of friction to what amounts to trying to join a big social circle.
shiroininja@lemmy.world 2 weeks ago
I had such a pain trying to get a consistent client working on mobile.