Some fantastic data mining detective work is revealed by Alexis Madrigal at The Atlantic:
One day, some drug dealer bought a particular digital scale—the AWS-100— on the retail site, Amazon.com. And then another drug dealer bought the same scale. Then another. Then another.
Amazon’s data-tracking software watched what else these people purchased, and now, if you buy the AWS-100 scale, Amazon serves up a quickstart kit for selling drugs.
Along with various scale-related paraphernalia, we find: