I'm sorry if i speak non-sense, since i don't really know much about coding and stuff, but about this "Selective Sync".. How would it work? a) It'll be just a list with the address book contacts to choose manually those who we previously know that have a whatsapp account. b) It will show only those of our contacts who do have whatsapp account to choose who we want on our contact list. c) Some other way i haven't thought of but tgalal has. I'm asking because a) wouldn't be practical at all for normal users, though they'd probably choose the auto sync option; and b) would be useless in terms of privacy protection (since it would require the availabilty check of our contacts accounts to know who we can sync in the app contact list) So, summing up my doubts, will this be just a particular option for those concerned about privacy issues, and will require users to previously know or find out through other means who in their address book uses whatsapp?