Google secretly tracking users offline purchase data with Mastercard:\u00a0Previously Google admits, they track users even after they turn off location tracking\u00a0and now this. Google has a secret deal with Mastercard\u00a0that allows it to track the user's offline purchase data so, they can link it with adverts.\r\n\r\nOver the past year,\u00a0the multi-million dollar deal has given the tech titan\u00a0unprecedented insight into\u00a0whether\u00a0the ads it runs online translate into real-world purchases.\r\n\r\nUsers are able to opt out of being tracked. However,\u00a0the deal, uncovered by this week by\u00a0Bloomberg, was not disclosed to the public by either Google or Mastercard.\r\n\r\nGoogle has boasted that this new feature for advertisers, called Store Sales Measurement, gives the company access to about 70% of U.S. credit and debit card data.\r\n\r\nThe company hasn\u2019t named who its partners are, but it\u2019s likely more than just Mastercard. It\u2019s currently being tested with a small group of advertisers, reports\u00a0Bloomberg. Google adds that users can opt out of this kind of tracking via its \u201cWeb and App Activity\u201d setting.\r\n\r\nYou can read the full Bloomberg report here.