Google has made millions of its users the targets of a test for a new ad program without informing them, warns a privacy activist group. The Electronic Frontier Foundation said Google's test trial of its Federated Learning of Cohorts without consent "is a concrete breach of user trust in service of a technology that should not exist." Under the program, Google Chrome browsers "will begin sorting their users into groups based on behavior, then sharing group labels with third-party trackers and advertisers around the web." "Although Google announced this was coming, the company has been sparse with details about the...