For the price of Facebook ...

30 F-35 Fighter Planes (when they're ready)
US$107m
OK so you won't be able to afford as many of these over-priced but stealthy jets as an actual country (the UK's planning to get over 100) but you wouldn't do badly with your own VIP fleet of 30. And just think, with your private air force you could scare everyone into giving you more cash, since you spent it all on gadgets..