A France 2 report on the use of our data by mass retailers

"Names, surnames, addresses, ages, but also passions and consumer habits: some companies collect a wealth of information about customers who buy on the Internet or through their loyalty cards. Over and over again, these companies record, compile and analyse the personal data they collect in order to better identify their potential targets. For a year, Cash Investigation investigated the marketing techniques of major groups such as Apple and Danone, and their secret commercial strategies. How do they impose their diktat on the market?
http://pluzz.francetv.fr/videos/cash_investigation.html