There are problems with the last two. Because of this, you may want to require users to register before using this application, and then link the app to their account.
When a user registers through facebook, they expect that all details will be kept there. This is a security thing, more than anything else, just like a user paying through paypal expects THEIR details to be kept @ paypal.
You can't mess with the facebook email addresses at all without screwing things up, unfortunately.
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