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Re:Ask HN: Conversion rate increase with a Facebook sign-on? by msencenb on Wednesday August 11, 2010 @02:13PM (#1595495)
After looking at the docs it doesn't appear to be incredibly hard.

I think the most non-trivial thing would be integrating with the current site sign-on. Issues such as an existing users that decide to sign on with facebook (which is linked to a different e-mail address) could become a problem on the backend.

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