Towards the end of 2010, a new report showed how dozens of sites were checking visitors' surfing history by exploiting a browser feature most of us know well.
A visit you make to any site is "remembered" by your browser so the next time the site name shows up in a search you make or on another website, it's colored purple instead of blue. That way, you instantly know you've been there before.
But this handy feature, which has been around almost as long as the Internet, means your previous Internet activity potentially could be "read" by simply looking for the color purple in your browser's records.
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