iTWire Google begins trial of experimental tech for ad targeting Shares Pixabay Google has begun a trial of its experimental new technology for ad targeting, known as Federated Learning of Cohorts, selecting a random set of users without notifying them, the Electronic Frontier Foundation, an organisation that fights for digital rights, says. A blog post by EFF staff technologist Bennett Cyphers said the only way people could opt out at the moment was by disabling third-party cookies. "We’ve been told that the trial is currently deployed to 0.5% of Chrome users in some regions – for now, that means Australia, Brazil, Canada, India, Indonesia, Japan, Mexico, New Zealand, the Philippines, and the US," he wrote.