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This is really old news. Here's an HN link discussing someone's batshit crazy startup idea based on it:

http://news.ycombinator.com/item?id=404564



It's definitely a useful trick for only showing certain content to certain users. For example, I wrote a script so you only show Digg buttons to visitors that have been to digg.com: http://int2e.com/blog/improved-digg-integration-script/


You don't even need Javascript.

    <a class="digg" href="http://digg.com/submit/">...digg button code...</a>
Now you can use CSS to hide visited links.

    a.digg:visited { display: none; }




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