"How Target Figured Out A Teen Girl Was Pregnant Before Her Father Did" --<a href="http://www.forbes.com/sites/kashmirhill/2012/02/16/how-target-figured-out-a-teen-girl-was-pregnant-before-her-father-did/" rel="nofollow">http://www.forbes.com/sites/kashmirhill/2012/02/16/how-targe...</a><p>This event is referenced in TFA. I remember reading it when it first came out and was (a) amazed at the ability to analyze purchasing data and come to conclusions such as this and (b) worried.<p>Previously, I never really cared for carrying cash so I used a credit card for almost everything I purchased -- online, of course, but also in person. Nowadays, I pay cash anytime I can: at the gas station, the supermarket, at restaurants, etc. I also stopped using my "loyalty" card at the supermarket and obtained a new one that was not connected to me in any way.<p>I'm not buying anything I shouldn't be, of course. I'm just of the "it's none of their business" mindset. This has carried over into other parts of my life as well, such as logging as little personal information as possible at work (ISP) and retaining it for as short of a period as possible.