BizSugar.com › News › How Companies Learn Your Secrets - NYTimes.com

Very long in depth article about how stores such as Target track your behavior so they can even predict what you want to buy and even predict when you are pregnant (a statistician at their company was asked “If we wanted to figure out if a customer is pregnant, even if she didn’t want us to know, can you do that? ” - the answer is yes they can)