Found 2 comments on HN
decebalus1 · 2019-06-14 · Original thread
This book goes into quite a bit of detail about various techniques retailers use to track customers.
JosephLark · 2017-05-24 · Original thread
Not Google specific, but some good reading on this topic came out in January - The Aisles Have Eyes: How Retailers Track Your Shopping, Strip Your Privacy, and Define Your Power [0]


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