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Zemanta is leading in The Entire Web.
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Rtoaster is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
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Zemanta has better usage coverage in more websites categories. Including Computers Electronics & Technology, Community & Society, Science & Education, Arts & Entertainment and 14 other categories.
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Rtoaster is leading in Travel & Tourism, Finance, Lifestyle, E-commerce & Shopping and 2 other categories.
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Zemanta is leading in most countries, including United States, India, United Kingdom, Canada and 91 other countries.
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Rtoaster is leading in Japan, Iraq, Bolivia and New Caledonia.