I am not familiar with the PCI compliance stuff, but I found this after a quick search: "How Companies Learn Your Secrets" http://www.nytimes.com/2012/02/19/mag

I am not familiar with the PCI compliance stuff, but I found this after a quick search: "How Companies Learn Your Secrets" http://www.nytimes.com/2012/02/19/magazine/shopping-habits.html http://www.nytimes.com/2012/02/19/magazine/shopping-habits.h...