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    Someone who works on web search once told me that they already have an algorithm that guarantees the maximum click-through rate for any web search: just return a page full of porn links. (Someone else said you can reverse this to make a porn detector: any link which has a high click-through rate, regardless of which query it’s answering, is probably porn.)

    Color me skeptical. Replacing the top link for “Thomas Edison” (wikipedia page) with a porn link will increase click through? And conversely, the wikipedia link which I suspect has a very high click through rate, already is a porn link?

    The only pervasive obsession with porn that I’ve ever noticed is the recurring claim that porn is magically responsible for everything else.