How Target Figured Out A Teen Girl Was Pregnant Before Her Father Did

Target assigns every customer a Guest ID number, tied to their credit card, name, or email address that becomes a bucket that stores a history of everything they’ve bought and any demographic information Target has collected from them or bought from other sources. Using that, Pole looked at historical buying data for all the ladies who had signed up for Target baby registries in the past.

[link to www.forbes.com]

This is why you have to stop using the little tags they give you at stores or debit and go cash only and when they ask for info you can say no!