I wonder if the inventor of the accelerometer envisioned this: an app used to create virtual crowds for supporting sports teams.
As part of its World Cup Japan 2012 sponsorship, Sony has released an app called Vamos Viewing which allows viewers anywhere to shake their Sony smartphones to show their team support. The shaking data is collected in real time and visualized with other fans. It's like creating a virtual crowd. Throw in some location data and you have some nice sensor fusion collusion going.
This is rather sweet in some ways if shaken in moderation. I'd like to see more like it.
The world is becoming a crowded place.