8. The device of claim 7 , wherein outputting the body language feature to the application comprises outputting the body language feature to a context-aware application.
9. The device of claim 8 , wherein the operations further comprise: receiving body language information associated with the body language feature; analyzing the body language information to determine a physical activity being performed by the user; selecting an advertisement appropriate for the physical activity being performed by the user; and providing the advertisement to the user.