MikeJ writes "Mind Candy, the makers of Perplex City, are testing the power of the Internet by asking that very question; they have recruited one of Earth's 6 billion residents — a man named Satoshi — to participate in this experiment.
It has been suggested that we are each only five to seven people away from any target in the world. Someone, somewhere, knows Satoshi — so we must track these people, and thus Satoshi, down using word-of-mouth communication. People from over 80 countries are already participating in the hunt, with more joining every day. Can you help find Satoshi?"