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When I try to add a comment using SocialCommentManager, the AddComment method throws an SPException saying

"The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again."

I have tried setting AllowUnsafeUpdates to true on the lists parentweb, but that don't work.

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Good question, our OOB Note Board Web Part stopped working suddenly and gives that error in ULS. – Jussi Palo Apr 16 '13 at 12:02

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