Well, of course, this would be about real-time access, which is not something covered by GDPR, which would be the basis for interoperability. So, you could move

Well, of course, this would be about real-time access, which is not something covered by GDPR, which would be the basis for interoperability. So, you could move to Bookface, and then your friends would have the option to allow Bookface access to their data on your behalf, in so far as they want to allow you to access it, in just the same way they would allow another user on Facebook to access it.