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A comment on Ask HN: I bought Voltaren at the chemist, now Google shows me ads for it. Why?. Parent comment
https://adwords.googleblog.com/2017/05/powering-ads-and-anal...
> Google’s third-party partnerships ... capture approximately 70% of credit and debit card transactions in the United States
See also https://www.bloomberg.com/news/articles/2018-08-30/google-an... and https://www.technologyreview.com/2017/05/25/242717/google-no... - Google has deals with the credit card providers to get purchase data so they can link them back to your online behavior.
https://adwords.googleblog.com/2017/05/powering-ads-and-anal...
> Google’s third-party partnerships ... capture approximately 70% of credit and debit card transactions in the United States
See also https://www.bloomberg.com/news/articles/2018-08-30/google-an... and https://www.technologyreview.com/2017/05/25/242717/google-no... - Google has deals with the credit card providers to get purchase data so they can link them back to your online behavior.