Kashmir Hill. How Target Figured Out A Teen Girl Was Pregnant Before Her Father Did. Forbes
This article talks about an algorithm that Target has. Based on what someone is buying and how much and how far apart the transactions are, basically target can tell if you’re pregnant. They assign a pregnancy score to you and will send you baby pamphlets in the mail. The article talks about a father who received his daughter’s target mail suggesting various baby things. He went target and complained. It seemed that target was able to find his daughter was pregnant well before him. He later visited and issued an apology.