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All of WhatsApp's growth has come from happy customers encouraging their friends to try the service.

At WhatsApp, our engineers spend all their time fixing bugs, adding new features and ironing out all the little intricacies in our task of bringing rich, affordable, reliable messaging to every phone in the world. That's our product, and that's our passion. Your data isn't even in the picture. We are simply not interested in any of it.

WhatsApp will bring Facebook another billion users. We will be a billion-user product. Whether there is a direct valuation or an indirect valuation, there is value, and Facebook understands that well.

Users get unlimited 'WhatsApp'. We get happy users who don't have to worry about data. Carriers get people willing to sign up for data plans.

If you were in Spain or Brazil, most of the population there is interacting with WhatsApp multiple times a day.

I think we basically saw that the messaging space is bigger than we'd initially realized, and that the use cases that WhatsApp and Messenger have are more different than we had thought originally.

Everybody who wants to join 'WhatsApp', we'll go out of our way to build a really awesome client for them.

WhatsApp's extremely high user engagement and rapid growth are driven by the simple, powerful and instantaneous messaging capabilities we provide.

WhatsApp is both disrupting and demonetizing the entire wireless industry, and now the Facebook acquisition provides the infrastructure needed for WhatsApp to begin offering voice calls. So instead of people paying on average $80 per month, users only have to pay $0.99 per year for the same services. Wireless carriers, beware.