There's been more than a few terrorist incidents connected to forums like 8chan. In terms of the physical damage these attacks are not a threat to society but that's true of all terrorism. The argument normally is that the psychological damage to society as a whole is worth throwing everything we have at it.
Large media outlets like The New York Times were instrumental in convincing the public that Saddam had WMDs and thus justifying the Iraq War. That conflict led to something like a million deaths (and counting), which is 1000x more than all the "Internet forum"- related terrorism put together.
Yet I don't see anyone calling for further control of The New York Times or implementing restrictions on the corporate media.
