Can I or a neutral third party audit your internal database to verify that my browsing history is not being recorded by you? Do you provide a list of all third parties with which you share information with so I can attempt to audit them as well?
What dispute resolution procedures do you support if I have reason to believe that you do, in fact, hold some of my personal information despite my express request? How would you respond to a request to purge an individual's records from your logs?
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I don't mean to put you, personally, on the spot. I'm sure your firm is perfectly ethical, and that you do listen for and take some action to honor DNT requests as far as you see fit. I'm also sure that were I at an advertising firm I wouldn't have any better policies. It's not your fault this is a stupid feature.
That said, to almost anyone outside the webdev community "Do Not Track" doesn't mean, "Track, but Anonymize" or "Track, but Don't Personalize", it means "Don't Create A Record I Was Here". I've yet to run across a single company, advertising or otherwise, that interprets it that way, though.