Symantec Security Response has found a new threat that spreads through Renren.com, which is a very popular Social Networking Site in China ala Facebook. The threat comes in a form of a Flash video, which pretends to be a famous Pink Floyd promotional video clip "Wish you were here."
Worm That Exploits your Friendship: http://www.symantec.com/connect/blogs/worm-exploits-your-friendship.