October 2008
July 2008
June 2008
Aza’s Thoughts » Blog Archive » Vote! How to Detect the Social Sites Your Visitors Use
by 3 others, 4 commentsBoth clever & scaryHow does SocialHistory.js know? By using a cute information leak introduced by CSS. The browser colors visited links differently than non-visited links. All you have to do is load up a whole bunch of URLs for the most popular social bookmarking sites in an iframe and see which of those links are purple and which are blue.