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Tracking cookies, pixels, etc., are implemented by server-side software; perhaps the matter you would like to contend is what the meaning of the word "placed" is.

Cookies are data that is placed on the visitor's computer. Tracking pixels are software instructions placed on the visitor's computer.

The tracking that is akin "remembering a face" is user agent and ip address tracking.

In my mind, a store that uses facial recognition software to track my movement within the store and purchasing habbits is still incredibly creepy and highly invasive of my privacy.

The government has automated license plate readers that do much the same thing. Their justification is, you're in a public place, you have no expectation of privacy. I'm a little more concerned about that.

If I don't want to be tracked, I can choose to shop at a different store. But I can't live in a system of underground tunnels.

In Germany, your privacy is protected in public places as well. A German court just recently ordered a German state to turn off an automated license plate reader: http://www.spiegel.de/auto/aktuell/b6-streckenradar-verwaltu... (only available in German)

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