Comment by antirez

This remembers me how an interoperability fiasco iMessage is. Just for the interoperability issue many iOS users are slowly switching to Whatsapp: you start using it to message your Android buddies at first, then eventually you want to just use a single app... the limiting factor for iMessage to be dismissed completely by some user is the fact that there is no way to message iPad users from Whatsapp, something they should fix IMHO.