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StumbleUpon Widgets is leading in The Entire Web.
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Opta Widget 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 Computers Electronics & Technology, Arts & Entertainment, Science & Education, Community & Society and 17 other categories.
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Opta Widget is leading in Sports, News & Media and Gambling.
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StumbleUpon Widgets is leading in most countries, including United States, India, United Kingdom, Italy and 125 other countries.
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Opta Widget is leading in Nicaragua and Jersey.