Google announces privacy changes across products; users can’t opt out

Google will soon know far more about who you are and what you do on the Web.

The Web giant announced Tuesday that it plans to follow the activities of users across nearly all of its ubiquitous sites, including YouTube, Gmail and its leading search engine.

Google has already been collecting some of this information. But for the first time, it is combining data across its Web sites to stitch together a fuller portrait of users.