In Rio De Janeiro, the following sequence has often taken place. "It's the typical tale of doomed Carnival romance: Boy spots girl in the sweaty crush of a street party. Moments later, they're locked in a passionate embrace. Then the crowd surges, and the human tide wrenches them apart, forever."
source But, this story has a happy ending! The NY Times reports that a new Internet blog has started that allows these "short term couples" to reunite.
This strikes me to be an excellent example of Gasper and Glaeser's point about Internet technology increasing the demand for cities. Funny?