http://www.nytimes.com/2010/04/17/business/media/17coupon.html?pagewanted=all

From the article:
And all that information follows that customer into the mall. For example, if a man walks into a Filene’s Basement to buy a suit for his wedding and shows a coupon he retrieved online, the company’s marketing agency can figure out whether he used the search terms “Hugo Boss suit” or “discount wedding clothes” to research his purchase (just don’t tell his fiancée).

Interesting and disturbing privacy implications.

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