WhatsApp takes about two clicks to setup. My 60 year old and generally technophobic mum and all her friends have managed to set it up and use it themselves (including group chats and profile pictures)
This is perhaps a giveaway that you're not in the US, where WhatsApp is generally not something people use to communicate. (Anecdotally, I have seen it primarily used among people who have families outside the US.) FaceTime, on the other hand, is widely used here.
