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WhosOn is leading in Top 1M Sites.
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Viacom Targeting is leading in Top 10K Sites and Top 100K Sites.
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WhosOn has better usage coverage in more websites categories. Including Business & Industry, Shopping, Computer & Electronics, Travel and 117 other categories.
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Viacom Targeting is leading in Arts & Entertainment, TV & Video, Music & Audio, People & Society and 15 other categories.
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WhosOn is leading in most countries, including Great Britain, United States, Germany, Ireland and 49 other countries.
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Viacom Targeting is leading in Brazil, Italy, Spain, Australia and 29 other countries.