My point is that data portability should be transitive. If by manually entering a friend's email address I 'own' that data, and it is thus valid for me to export, any service that imports that data should also allow exporting it. Otherwise it's lossy if I want to move on to another service.
In the FB case it's perfectly reasonable to prevent me from exporting data that I didn't provide, especially if another user provided it and has set privacy controls around it.
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Why can't you just get them from Gmail?
My point is that data portability should be transitive. If by manually entering a friend's email address I 'own' that data, and it is thus valid for me to export, any service that imports that data should also allow exporting it. Otherwise it's lossy if I want to move on to another service.
In the FB case it's perfectly reasonable to prevent me from exporting data that I didn't provide, especially if another user provided it and has set privacy controls around it.