I have heard of it and have used it - I'm not surprised at the 450 million users figure, but the global messaging market is measured in in billions. Even peopl

I have heard of it and have used it - I'm not surprised at the 450 million users figure, but the global messaging market is measured in in billions. Even people in third world countries use SMS - they do not have the ~90% marketshare which YouTube had when it was purchased. In Australia it just, for some reason, never caught on - many people I know have accounts (as many as say, Instagram, for comparison) - it just seems to be something people try but don't stick with. Which in a sense, is a pity, as it's demonstrably better than SMS. But in Australia Facebook Messenger already has the equivalent marketshare. Perhaps between Facebook Messenger and WhatsApp, Facebook would end with a majority marketshare [of IP-based messaging] as one app is popular where the other isn't. I honestly wouldn't know.