In case there was any doubt about the spread of mobile Internet usage, here's a video showing the spread of Android smart phones and tablets, from 2008 to now.

It would be interesting to see a similar graph for Apple's iOS.

Global Android Activations

Besides, it's a cool video.

And then there's the CEO of Google, in this video, talking about how much faster mobile usage is growing - faster than even they predicted:

Mobile Growing Faster Than All Our Predictions