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> How can it be that having intimate knowledge of someone would not allow you to sell them more stuff?

It allows you to sell more ads to the marketing people since it sounds very compelling. So there is your model.

The fact that I am still shown ads for items of the complete opposite (football) team that I am clearly (online visible, on FB, in my gmails, from my google search history, from my chrome browsing habits) fan of; show the targeting is still... moderate to say the least.



Google has probably put in you in the category interested in "sports", without giving it a second thought.




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