How do you go 3 years collecting personal information and just now realize it
Actually it was 600gb, but you took the time to write that all out :O. Although the data's not really usable--it picked up bits as it traveled past unsecured networks.
Ya know, I thought that was the wrong number, but I figured I'd go with what the commenter had said.
And yea, it really is useless data. What could they have picked up in that short amount of time? A Credit card number? Nope, encrypted with SSL. An email? Generally sent with SSL. They probably got some random bit of porn.
Actually, I was watching the news yesterday, and apparently, anyone can see your Facebook profile (if you accessed it) on a public wifi network with a quick, legal program. So I'm sure Google must've gotten that sort of thing if the unlucky person was on Facebook as the car passed.
All in all, Google fail. Oh, and review your code. :P