Facebook doesn't approve the app for the plugin FB use, this is their answer:
Your screencast doesn't show how the use of this permission directly improves the user experience in your app. Unfortunately, we also weren't able to determine this from testing your app manually.
All permissions data must be visibly used within your app. We do not accept permission requests for data that you may decide to use later.
Please provide screencast demonstrating use case for permission
please help :(