Advertise on Earth
Web 2.0 unleashes itself on the physical world. As the earth´s cartography is re-organized according to Google, it still seems to be behaving as a benevolent dictator as it advertises the Google Maps´planes flight paths so the public can participate in the updating of the maps; leading as of yet, to Space Invaders and Spam graffitied upon the globe.
Update: A more puerile example.
Update: A more puerile example.