Zuck needs protection from foreign governments, spy agencies and prying hedge funds or just from anyone that could profit/benefit from harming or spying on him.
$14m in security. Where does that money even go, high-tech weapons?
The Internet tells me executive protection bodyguards run about $150/hr, so let's presume Zuck springs for that. There are about 8760 hours in a year, so a single bodyguard 24/7 runs $1.3m/year. $14m sounds like half a dozen people plus expenses and overhead.