It's definitely a useful trick for only showing certain content to certain users... | Hacker News

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		int2e on May 20, 2009 \| parent \| context \| favorite \| on: Hack: Site steals your browsing history based on U... 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/

beza1e1 on May 20, 2009 [–]

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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