A friend of mine is going abroad and because he uses blackberry he has to have a data plan to BBM even when he can connect via wifi, and there is no skype for BB for the network he uses. This sent him looking for another communication app and he found whatsapp and I decided to pay the 1$ to get it on my IPhone.
Right now from my limited usage I am disappointed as I assumed the hype had a merit but I don’t see a reason to use it when I don’t have too.