YbuPorn is hot stuff-ranking 71 on the Alexa list of the Web's 100 most popular websites, below About.com but above the New York Times. YouTube-inspired, it attracts people who want to watch sex videos. But viewers were, until recently, subject to some voyeurism themselves. The Netherlands company behind YouPorn wanted to know what other porn websites users had visited. So it secretly checked their browsers to record exactly that, according to researchers. YouPorn has not commented but was apparently gathering the information to see how it stacked up against competitors.
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