Google users give up their PII the moment they sign up for an account. If you also use Google Wallet or pay for any Google service, you've given them the abilit

Google users give up their PII the moment they sign up for an account. If you also use Google Wallet or pay for any Google service, you've given them the ability to associate some representation of your credit cards with you as well. Together with Location Services, they know everywhere you physically go, so given the last 4 digits of your cards and a transaction list it's pretty easy to guess who you are.