Generate text that refutes this claim: Social networks serve as a powerful signalling device for the expansion of violent behaviour  By using Twitter to signal the start of riots it attracts people to join the mob. People in riots generally look to those around them in order to see what is considered acceptable behaviour. As boundaries are crossed, such as the change from indiscriminate vandalism to looting, and reported on Twitter, the same behaviour echoes elsewhere. The lens through which rioters determine acceptable behaviour is expanded, so the chance of behaviours like looting rippling across the various mob groups within a locale increases. One escalation of violence becomes multiple escalations. Twitter is thus a serious danger to society during periods of social unrest and rioting, because it acts as a catalyst for further mayhem. By blocking Twitter governments are able to manage flashpoints and prevent them from expanding violence to other locations. This makes riot situations both less likely to escalate, and easier to break up.
access information house would block access social messaging networks
Rioters will always find tools by which to organize. The internet is a remarkably fecund environment, one in which solutions to problems are quickly found. If the government were to block Twitter, enterprising demonstrators would quickly find an alternative. The violence will still escalate, and blocking out a website will fail to accomplish anything other than alienate Twitter users from the state and anger at its impositions.