Beyonce performs onstage in 2013 at the Barclays Center in Brooklyn, N.Y. Rob Hoffman/Invision for Parkwood Entertainment hide caption

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Can't Buy A Ticket To That Concert You Want To See? Blame Bots

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By hijacking a user's computer, "bad" bots make it look as if she visits a website often, thus making the site more valuable to advertisers. iStockphoto hide caption

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In A Battle For Web Traffic, Bad Bots Are Going After Grandma

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