Chances are you know you’re being tracked online. Most of us are at the point where we’re not surprised when an ad for something we searched for on one site appears on the next site we visit. We know that many pages (yes, this one you’re reading, too) drop cookies and other scripts into our browser to keep tabs on our activity and sell us stuff.
A new survey from a group of Princeton researchers of one million websites sheds some light on the cutting-edge tricks being used to follow your digital trail. Rather than placing a tracker on your browser, many sites are now “fingerprinting” — using information about your computer such as battery status or browser window size to identify your presence.