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A comment on Google and Mastercard Cut Ad Deal to Track Retail Sales. Parent comment

Re:Google and Mastercard Cut Ad Deal to Track Retail Sales by rapnie on Friday August 31, 2018 @02:45AM (#17883444)
Yes. And isn't it also the case that, by offering their very elaborate targeting capabilities to advertisers, they still leak your personal data to 3rd parties, though indirectly? After all, the fact that a certain personalized ad appears in your page confirms to the advertiser that you are in their carefully crafted target group.
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Re:Google and Mastercard Cut Ad Deal to Track Retail Sales by skj on Friday August 31, 2018 @06:50AM (#17884458)
(I work for Google, but not on ads and I have no social knowledge)

I think that one thing Google tries to do is to make identifyingly small demographics not possible. As you say, that would leak personal info when the user clicked.

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Re:Google and Mastercard Cut Ad Deal to Track Retail Sales by icebraining on Friday August 31, 2018 @05:16AM (#17884090)
confirms to the advertiser

How would the advertiser know? Google is the one serving the ad.

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Re:Google and Mastercard Cut Ad Deal to Track Retail Sales by ehnto on Friday August 31, 2018 @06:59AM (#17884488)
Tracking referals. It's a key part of ecommerce advertising metrics to keep track of who came from what campaign.
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