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I'm fairly certain it is. Billionaires and their families are at a high risk of being kidnapped and ransomed. Then there are stalkers, and obsessives who might try to enter your home and endanger you and your family.

I imagine as CEO of Facebook he probably receives a lot of hate mail and possibly threats. Better safe than sorry.

Zuckerberg is also quite a private person (as you can probably tell from him buying up surrounding homes to distance himself from the neighbours) so scaring off journalists and paparazzi is probably an intended effect of his security detail.

Well, if some rando on the internet is going to dig through your trash, and write a blog post about it, than maybe you are famous enough to justify more paranoid security.

Well, they have the apparatus of the entire state protecting them, so the guys directly on the payroll are mostly just for show.

The arrival time of PD is going to be minutes to tens of minutes in those cities depending on the severity gleaned by dispatch, and only from the time of _notification_ not the start of an incident.

I don't think it's unreasonable for someone of his wealth and fame to have 24/7 guards. Their primary duty would be to lessen that time of notification and dispatch of PD, and casually act as a deterrent.