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When I registered the app with Facebook I had to specify site URL.  If I specify the URL in "example.com" format the authentication won't work if the user is on "www.example.com".  The reverse is true if I register the app the other way.  Does anyone have a solution for this?

My Q&A site is PCSAnswers.com.


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Use a 301 redirect. For example, redirect all users from www.example.com to example.com. That way you only have one site and it should work.