Immagine the situation: a button opens a popup window! But to open this window, you have to be sure that the user has granted your app his email address.
If the user has declined the email authorization in the first place, you will have to ask him again.
To ask him, facebook grant you the tool with... a popup window, and asynchronous treatments. But then we will be unable to open OUR popup, since we are no more on a direct action made by the user.
Is it possible to ask for a permission and open a custom popup window with just one user action?
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