In iOS 5 you could open a Facebook Page in the native app by accessing fb://page/585828424 in Safari [1]
This doesn't seem to work on the iOS6 Facebook App (testing on app v.47423 on an iPhone 5).
Is there a work around or is direct linking just a retired feature?
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[1] Open a facebook link by native Facebook app on iOS
Also, if it's helpful, here's a list of what was possible in iOS 5 using fb://something