Sometimes called a "hacktivist", Anonymous is an enigmatic global collection of people who started as pranksters and evolved into online vigilantes who insist they have no leaders.
"There is no membership. You can't join the club. You can't sign up." said Ryan Singel, staff writer for WIRED magazine. "There are just a couple of places they hang out online and if you want to say you're part of anon then you're part of anon."