Relationship between Wikimedia and Facebook, Inc.
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Perennial proposals to add "like" buttons or "share" widgets on pages have been rejected on English Wikipedia due to concerns over neutrality and design,[1] but they are used on some other projects.[2]
There was a proposal to add Facebook-login as an optional login-method, which was rejected.[3]
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The Wikimedia Foundation has begun work to allow donations through Facebook.[4]