Here's the challenge by DARPA Network Challenge (Red Balloon Challenge) from 2009. http://en.wikipedia.org/wiki/DARPA_Network_Challenge http://en.wikipedia.org

Here's the challenge by DARPA Network Challenge (Red Balloon Challenge) from 2009. http://en.wikipedia.org/wiki/DARPA_Network_Challenge http://en.wikipedia.org/wiki/DARPA_Network_Challenge The challenge was to find 10 red weather balloons located somewhere in the US. Dr. Crane and a team from the MIT Media Lab won it by using viral spreading through social networks.