Google began to use billions of records about bank transactions to prove that online advertising really encourages people to make purchases, and not only in online stores, but also in real shopping centers.

This step will allow Google to determine the sales volumes that generate advertising campaigns on the network - a goal that has long attracted the entire advertising industry. However, it also entails a new wave of fears regarding the preservation of confidential data.

To collect data for its advertising colossus, Google is already analyzing the history of searching the network and geolocation, using information obtained from YouTube, Gmail, Google Maps and Google Play. All this information is "tied" to the user's account.

New data on bank cards will allow the company to link the customer's digital footprint to the records of purchases in the real world.

And many may consider this an intrusion into a too personal space, despite assurances from Google that the company will take all necessary steps to protect personal information.

Google does not provide details on how this system will work and which companies will analyze data on credit and debit cards, The Washington Post reports, but says that the protection of confidential information will be entrusted to patented mathematical formulas that will hide the names of buyers, so that Compare the identity of the client with time, place and amount of purchase will be impossible.