What percentage of people play social games on the iPhone? I know anecdotes aren't data, but I've had an iPhone since day 1 and have never bought or played a game on it.
My iPhone has completely supplanted my Nintendo DS for subway entertainment. Based on what I've seen on the subway, it's by far the most popular portable gaming platform, at least in NYC.
Considering that games are the most popular form of application in the app store (currently 9/10 top grossing and 6/10 top free apps are games), I think the percentage is quite high. With an XBox Live-like framework for achievements and friend leaderboards even single-player games can be social.
