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The Freakonomics blog and search-data company Hitwise found that there are quite a few Gmail users who accidentally end up at GM.com when they mean to go to Gmail.com. In fact, 0.94 percent of GM.com visitors go to Gmail.com on their next page load versus 0.14 percent for Toyota.com to Gmail. No word from GM, but it's doubtful that any of these accidental visits turned into purchases. (Photo by AP/Paul Sancya)