<p>Gone are the days when web surfers only left footprints behind on isolated single-server web sites across the WWW. Today, a significant number of websites now contain tracking code that allows a select few organizations to track individual users, even entire corporate populations, across tens of thousands, sometimes hundreds of thousands of sites. This talk explores the technical methods used to embed tracking code and presents results from our analysis of the top sites in Alexa's website rankings. You'll leave the talk with a better understanding of the problem while learning which popular websites contain tracking code and with whom they are sharing information.</p>