We don't have code to do this off hand. You can't get their true email address, and FB has been changing it's privacy policies and their usage of 'psuedo-emails' seems to be changing as we speak. We're not too excited to implement to such a moving target and are holding off for the time being on doing this.
There's another thread regarding the FB email address below, which we'll try to aggregate these posts into:
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Create New Joomla Users: No - I want to use thier FB email
