Amazon is blocking Google’s FLoC

Most of Amazon’s properties including, and are preventing Google’s tracking system FLoC — or Federated Learning of Cohorts — from gathering valuable data reflecting the products people research in Amazon’s vast e-commerce universe, according to website code analyzed by Digiday and three technology experts who helped Digiday review the code.

Amazon declined to comment on this story.

As Google’s system gathers data about people’s web travels to inform how it categorizes them, Amazon’s under-the-radar move could not only be a significant blow to Google’s mission to guide the future of digital ad tracking after cookies die — it could give Amazon a leg up in its own efforts to sell advertising across what’s left of the open web.


Digiday watched last week as Amazon added code to its digital properties to block FLoC from tracking visitors using Google’s Chrome browser. For example, while earlier in the week and did not include code to block FLoC, by Thursday Digiday saw that those sites did feature code telling Google’s system not to include activities of their visitors to inform cohorts or assign IDs. But Amazon’s blocking appears scattered.


Source: Amazon is blocking Google’s FLoC — and that could seriously weaken the system

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