A Mac and PC Trojan is being perpetuated through Twitter, accounts say. Guy Kawasaki, a well-known venture capitalist, is said to have accidentally retweeted a link to a porn video, claiming to contain footage of Gossip Girl actress Leighton Meester. Should users actually click the link, they are taken to a website asking to install a video codec; the file is in reality the OSX/Jahlav-C Trojan,
