The sales information that advertisers receive is anonymous, said Baser. “You would see the number of people who bought shoes,” he said, using the example of an online shoe retailer. But marketers would not be able to get information that could identify the people, he added.
Remember that, when you drill back far enough, at some point the information is no longer anonymous. Facebook knows who clicked what. In fact, with their persistent cookies, they can know even if you are not logged in to Facebook.