Wikimedia Foundation

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The Wikimedia Foundation is the non-profit organization that operates Wikipedia – one of the most popular websites in the world, serving nearly half a billion users every month. It is the only non-profit in the top 50 websites, supported by a community of millions of individual donors. Join the Wikimedia Foundation in our ambitious project to empower people to create and share the sum of all human knowledge. 

http://wikimediafoundation.org
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