Tracking Is an Assault on Liberty, With Real Dangers

WSJ
"But our sense of anonymity is largely an illusion. Pretty much everything we do online, down to individual keystrokes and clicks, is recorded, stored in cookies and corporate databases, and connected to our identities, either explicitly through our user names, credit-card numbers and the IP addresses assigned to our computers, or implicitly through our searching, surfing and purchasing histories.

A few years ago, the computer consultant Tom Owad published the results of an experiment that provided a chilling lesson in just how easy it is to extract sensitive personal data from the Net. Mr. Owad wrote a simple piece of software that allowed him to download public wish lists that Amazon.com customers post to catalog products that they plan to purchase or would like to receive as gifts. These lists usually include the name of the list's owner and his or her city and state.

Using a couple of standard-issue PCs, Mr. Owad was able to download over 250,000 wish lists over the course of a day. He then searched the data for controversial or politically sensitive books and authors, from Kurt Vonnegut's "Slaughterhouse-Five" to the Koran. He then used Yahoo People Search to identify addresses and phone numbers for many of the list owners.

Mr. Owad ended up with maps of the United States showing the locations of people interested in particular books and ideas, including George Orwell's "1984." He could just as easily have published a map showing the residences of people interested in books about treating depression or adopting a child. "It used to be," Mr. Owad concluded, "you had to get a warrant to monitor a person or a group of people. Today, it is increasingly easy to monitor ideas. And then track them back to people."