He also has access to a large glass-walled conference room in the middle of the space near his desk, which features bullet-resistant windows and a panic button. There’s also a persistent rumor among Facebook employees that he has a secret “panic chute” his team can evacuate him down to get him out of the office in a hurry. The truth of this matter remains murky: One source said they had been briefed about the existence of a top-secret exit route through the floor of the conference room into the parking garage, but others said they had no knowledge of it. Facebook declined to comment on this.

I can buy the paranoia after the attacks on Google; they abuse their users in similar fashion.