Where are the other 61% of mobile users coming from?? I know facebook has been focusing on making their mobile site available on all platforms, but I didn't thi

Where are the other 61% of mobile users coming from?? I know facebook has been focusing on making their mobile site available on all platforms, but I didn't think they would realistically have more than half the visits coming from non-smartphone devices. I doubt Blackberry and WP is more than 1 or 2%. Also, does android come with facebook already installed? I don't think iOS does, which could account for the difference between mobile web and app.