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FeedBurner is leading in The Entire Web.
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SpotX is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
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FeedBurner has better usage coverage in more websites categories. Including People & Society, Arts & Entertainment, News & Media, Computer & Electronics and 142 other categories.
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SpotX is leading in Adult, Sports, Chats & Forums, Autos & Vehicles and 90 other categories.
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SpotX is leading in most countries, including United States, Germany, France, Austria and 115 other countries.
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FeedBurner is leading in India, Brazil, Russia, United Kingdom and 92 other countries.