[striking]

Whatsapp is really a special case, though. They cornered a market that's relatively unique. Third-world countries don't need another messaging app.

[stingraycharles]

And from my experience here in Cambodia, everyone is using Facebook anyway. So it isn't a clear black and white "third world countries only use whatsapp" either.

Also, there is a severe desire of everyone to buy an iPhone -- so they just lag behind a lot. You can buy a pre-jailbroken iPhone 4G for around $100 here.