I think his view on the address book as your personal social graph is interesting. Because this has been mainly discussed as privacy violation because it involv

I think his view on the address book as your personal social graph is interesting. Because this has been mainly discussed as privacy violation because it involves uploading the address book to a server to check for in-network users. But it has also another side and sadly this side as an independent social graph is mostly ignored, at least in Germany. How is this being discussed in other places? I had this discussion when WhatsApp turned on full end to end encryption.