@BR, I am reliably informed by undisclosed sources that tin hats don't work very well.
A full-body-suit faraday-cage with integral electronic jammers would work well, except for complications arising from the need to eat or eliminate waste. Which could be solved by the safe/room also being a faraday-cage with jammers.
Alas, I cannot look at that Facebook reference because I have no Facebook account. Why give anybody personal information that increases the possibility of identity theft, being spied on, etc...