[seabass-labrax]

I think it's a joke on the claim that Twitter would become an 'everything app' when it became X. The software X11, being a windowing system, actually is a system for running 'every app', in a way.

[snvzz]

X11 is a protocol, not a window manager.

[seabass-labrax]

Good point; I've edited my post so that it's more accurate.

[jbverschoor]

Yes that was the joke :)