The WiFi part I was clearly wrong about, it ended up being Apple and not a shift in communications standards that was the key disruptor for the industry. But I disagree on the other two points. If someone is playing a game on their iPhone today then it is pretty obvious, or at least much more obvious than the pre-iPhone days when cell phones had tiny black and white screes. And as for the thing about women, women used to store their cell phones in their purses and not in their pants until phones like the iPhone and the razor came along. Without this shift it would have been very, very difficult for services like twitter to have taken off.