How bizarre: Japan is behind the west not only with social media, but also with smartphones. It's only now that iPhones etc is starting to take off there.
I wonder what could cause this? They love gadgets, love Apple products. And they even have a whole sub-culture of short novels written specifically to be read on mobile phones! Because they're packed like sardines on the trains, see, no space for a laptop, maybe not even an iPad. So smartphones should be a perfect fit there. (It seems Kindle has not yet been launched in Japan though it should be close.)
I'm sure it'll come fast. If they like reading on a crude Nokia display on the subway, just wait til they try it on the high-rez display on the iPhone 4.