title: facebook: changing permissions of an existing application
body: <p>We have already launched an application, but we clearly see now, that we need publish to wall permission (our approach with not requiring this from user and basing on invites doesn't work well). Can we do it? How to make sure, that users will be instantly notified about the need of accepting new permissions, rather than having our application malfunction, if they don't have them yet?</p>