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httppool is leading in Top 100K Sites.
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AdvertServe is leading in Top 1M Sites.
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AdvertServe has better usage coverage in more websites categories. Including Arts & Entertainment, Sports, Computers Electronics & Technology, Health and 18 other categories.
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httppool is leading in News & Media and Food & Drink.
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AdvertServe is leading in most countries, including United States, Germany, Russia, United Kingdom and 40 other countries.
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httppool is leading in Bulgaria, Serbia, Macedonia, Slovenia and 21 other countries.