The Facebook API allows 3rd party applications to access most of the user's data, including the user's email, if the user grants the application the required pe

The Facebook API allows 3rd party applications to access most of the user's data, including the user's email, if the user grants the application the required permissions. More details are at http://developers.facebook.com/docs/authentication/permissions http://developers.facebook.com/docs/authentication/permissio.... (I work on the Facebook platform.)