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PUBLIC MARKS from sbrothier with tags javascript & "social bookmarking"

26 September 2008 08:30

Aza’s Thoughts » Vote! How to Detect the Social Sites Your Visitors Use

by 5 others
How 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. It’s not perfect (which, from a privacy perspective, is at least a little comforting) but it does get you 80% of the way there. The best/worst part is that this information leak probably won’t be plugged because it’s a fundamental feature of the browser.