As people have mentioned already, Whatsapp is successful because it is simple and functional. Just because the revenue model of Whatsapp is simple doesn't mean

As people have mentioned already, Whatsapp is successful because it is simple and functional. Just because the revenue model of Whatsapp is simple doesn't mean it is less effective. Moreover, I believe 'platforms' are overrated. Facebook is a platform. But it is trying really hard to stay relevant today ($19 billion!). Messaging should be private; not a platform.