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One use case is the following.
I ask for a Facebook access token to new users with the offline_access permission and I store it for later use. If the user remove in his settings the offline_access permission the token becomes invalid.
I would like to be able to test (maybe using the graph API) if the token I have still have the permissions I asked for, without waiting the user to log out to try to make an API call.
Just call the Permissions graph api method. You could parse the json response and look to see if “offline_access” exists or not. The url format is: https://graph.facebook.com/me/permissions?access_token=… You can access an example of it by going here and clicking the permissions link there. The