Zucks personal conference room has 3 glass walls, so I’ve been amusing myself imagining him just throwing a chair through one of the walls

That glass is bullet resistant.

Do they (you?) call him that at FB?

Yes, "Zuck".

I'm assuming someone in building security has watched the end of Ex Machina...and applied some learnings, or not.

All doors are glass with the right combination of a halligan bar, an axe and a gasoline powered saw.

And I guess beyond that point, walls are glass. Or you need explosives.