Invented by a 17 year-old Russian dude, this is the biggest attraction on the Net at the moment. The principle is quite simple. You can chat with somebody on a random basis via your webcam (no limits, you can do whatever you want) but then, you can't reconnect with him/her in the future. This is nuts, a lot of vulgar things, a lot of fun as well. Well, impossible to describe...just make a try http://chatroulette.com/
Articles available everywhere. One video among millions of them...Russians are really creative when they want to.