Coventry cat tormentor Mary Bale has become the latest victim of 4chan - a website credited with creating some of the web's biggest phenomena, whose users wreak havoc across cyberspace. Just what is it all about? When CCTV footage emerged of a middle-aged lady stroking a cat before dumping it in a wheelie bin, millions were outraged. But in one murky corner of the internet, the scent of blood was