I don't now If you have met with Chatroulette. It is service built by 17 year old Russian that connects you with random online user. Service demographics is 75% boys, 20% boys mastrubating and 5% of girls asking "what the hell I'm doing here" . Miraclely, it got traction of millions an success of Chatroulette came from nothing interesting going on web. And it is not even new idea, Chatroulette idea existed 15 years ago, but back then it was lame. Anyway, Chatroulette represents how service can get traction on millions of users with close to zero invests.
Chatroulette came from Russia but best usage came from Ben Folds in video above. Enjoy!