You should read this article about Target going to great lengths to figure out which customers were pregnant. https://www.nytimes.com/2012/02/19/magazine/shoppi

You should read this article about Target going to great lengths to figure out which customers were pregnant. https://www.nytimes.com/2012/02/19/magazine/shopping-habits.html https://www.nytimes.com/2012/02/19/magazine/shopping-habits....