Snip!t from collection of Alan Dix

<p>Web developer <a href="http://azarask.in/blog/">Aza Raskin</a> knows we visit Digg, Del.icio.us, Reddit and Facebook without even having to ask.</p> <p>No, he isn't employing privacy violating hackery, but <a href="http://azarask.in/blog/post/socialhistoryjs/">he is exploiting a "cute" information leak in CSS</a> that traditionally displays visited links differently than those that have yet to be visited. By loading in an iframe a list of social site URLs to see which are purple (visited) and blue (not visited), an assumption can be made on what sites to prompt users for submitting a story or blog entry.</p> <p>Raskin has wrapped this functionality in a script called <a href="http://code.google.com/p/aza/source/browse/trunk/SocialHistory/SocialHistory.js">SocialHistory.js</a>.</p>