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Contact At Once! is leading in Top 10K Sites, Top 1M Sites and The Entire Web.
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Flattr Button is leading in Top 100K Sites.
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Flattr Button has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, Games, Reference Materials and 18 other categories.
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Contact At Once! is leading in Vehicles and Business & Consumer Services.
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Flattr Button is leading in most countries, including Germany, France, Austria, China and 71 other countries.
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Contact At Once! is leading in United States, Canada, United Kingdom, Philippines and 7 other countries.