For the past year, select Google advertisers have had access to a potent new tool to track whether the ads they ran online led to a sale at a physical store in the U.S. That insight came thanks in part to a stockpile of Mastercard transactions that Google paid for. The revelation comes amid heightened concern about how much consumer data is consumed by tech companies like Google. Earlier this year, Facebook was criticized when data on as many as 87 million people was improperly shared with Cambridge Analytica, raising…
Read MoreGoogle reportedly paid millions of dollars in secret data deal with Mastercard to track retail sales
