Basically what Voldemort and Taliban would be as an Internet site, talking shit about 4Chan or even saying 4chan is forbidden on some forums because they're afraid that 4Chan members will pickup on it by Google search and wreck their sites. 4Chan is anonymous's stomping grounds and they're guys you don't want to fuck with, and they have the ability to ruin your life well pass the internet as they are quite skilled and cool hackers. They were even revving up to take on AT&T for a supposed site banning around late 2009.
Their latest thing has been the Jessi Slaughter fiasco, which everyone thought was going to be the end of 4Chan, but it wasn't. It also led to a war on Gawker.com that failed, not because the 4chan hackers suck, because Gawker got lucky and it was an unorganized raid on Gawker's servers, and some of Gawker's technicians caught it before it could go down.
"Hey man 4Chan is possibly responsible for making the internet a way cooler place. Not to mention most people use memes from their without even recognizing it.