The Web companies are, in effect, taking the trail of crumbs people leave behind as they move around the Internet, and then analyzing them to anticipate people’s next steps. So anybody who searches for information on such disparate topics as iron supplements, airlines, hotels and soft drinks may see ads for those products and services later on.
Consumers have not complained to any great extent about data collection online. But privacy experts say that is because the collection is invisible to them. Unlike Facebook’s Beacon program, which stirred controversy last year when it broadcast its members’ purchases to their online friends, most companies do not flash a notice on the screen when they collect data about visitors to their sites.
“When you start to get into the details, it’s scarier than you might suspect,” said Marc Rotenberg, executive director of the Electronic Privacy Information Center, a privacy rights group. “We’re recording preferences, hopes, worries and fears.” (NYT link)