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StumbleUpon Widgets is leading in The Entire Web.
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UpSellit is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
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StumbleUpon Widgets has better usage coverage in more websites categories. Including Arts & Entertainment, Science & Education, News & Media, Community & Society and 15 other categories.
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UpSellit is leading in Computers Electronics & Technology, Lifestyle, Health, Finance and one other category.
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StumbleUpon Widgets is leading in most countries, including United States, India, United Kingdom, Italy and 117 other countries.
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UpSellit is leading in New Zealand, Qatar, Oman, Paraguay and 4 other countries.