Originally Posted by Thor

You know that when you visit the US you'll have to be fingerprinted/iris-scanned and give DNA samples in the future? There's nothing to stop them selling your information to insurance companies as you are not a citizen and have voluntarily given up your information by visiting. Passports are all going towards incorporating biometric data.

In the UK there are CCTV cameras everywhere you go. Anyone can track credit card/debit card data and track you where you are. Mobile phone companies can get your location everywhere you go with cell tower triangulation. If you have a travel pass, that will allow tracking of where you go. A GPS device in your car will track your car etc etc.

Whether you like it or not, there isn't really much outside your head that isn't known about you.