There's some details here:
https://www.bloomberg.com/news/articles/2016-04-28/facebook-...
I think calling four full time guards a "small private army" is a little hyperbolic, but it is safe to say he is heavily protected.
https://www.bloomberg.com/news/articles/2016-04-28/facebook-...
I think calling four full time guards a "small private army" is a little hyperbolic, but it is safe to say he is heavily protected.