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FeedBurner is leading in The Entire Web.
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RichRelevance is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
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RichRelevance is leading in Lifestyle and E-commerce & Shopping.
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FeedBurner is leading in most countries, including United States, Russia, India, Italy and 96 other countries.
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RichRelevance is leading in United Kingdom, Sweden, Australia, Denmark and 8 other countries.