This was an interesting question a client asked me recently. The answer wasn't entirely surprising judging from the May Hitwise data below:Source: Hitwise, May 2009The Hitwise data featured is based on U.S. market share of visits as defined by the IAB, which is the percentage of online traffic to the domain or category, from the Hitwise sample of 10 million U.S. Internet users. Hitwise measures more than 1 million unique websites on a daily basis, including sub-domains of larger websites. Hit

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