This will become more of a problem with the invasion of IoT and other cross platform internet enabled devices. I found out recently that target uses the gps on your phone to see what products you are interested in then promotes them to you via web retargeting.
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Good to know. Thanks for the feedback.
Do you think I should write a post about this? Not sure how many know about it.
http://lifehacker.com/how-retail-stores-track-you-using-your-smartphone-and-827512308