It's George Orwell's 1984!
I studied this in school (a lifetime ago) about how your credit card spending and a computerized checkout system in a store can create a data mining system based on customer buying patterns.
It's taken a long while for someone to make it really work, but it seems Target has done it successfully done it now.
http://www.forbes.com/sites/kashmirhill/2012/02/16/how-target-figured-out-a-teen-girl-was-pregnant-before-her-father-did/
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