Once upon a time I used to work for a multinational company that did retail audit. They had developed a program which adjusted the ads a selected group of people were watching on their TVs. Then they provided them with special debit cards and monitored the relevance between viewed ads and purchases of goods in super markets. All that around 1999. And that was just once of a multitude of technologies they used. They also had a technology where a camera was tracing face movement to identify which items on the shelves attracted more attention by gender and age. I can’t even fathom what they’ll be using these days. Profiling is the holy grail of the marketing world. At least online we have the option of ad blocking. Offline we’re helpless.