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Quantcast is leading in Top 1M Sites and The Entire Web.
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DoubleClick Floodlight is leading in Top 10K Sites and Top 100K Sites.
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DoubleClick Floodlight has better usage coverage in more websites categories. Including Computers Electronics & Technology, Vehicles, Food & Drink, Finance and 9 other categories.
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Quantcast is leading in Arts & Entertainment, Games, Science & Education, News & Media and 7 other categories.
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Quantcast is leading in most countries, including United States, United Kingdom, France, Spain and 137 other countries.
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DoubleClick Floodlight is leading in Japan, Canada, Australia, Russia and 20 other countries.