U.K. May Block Twitter, BlackBerry Services in Future Riots

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David Cameron, the U.K. prime minister, said the government is considering whether it should block social-networking websites and messaging services during violent unrest after the country’s worst riots since the 1980s.

The government is working with police, the intelligence services and companies to look at “whether it would be right to stop people communicating via these websites and services when we know they are plotting violence, disorder and criminality,” Cameron said today in parliament. He mentioned Research In Motion Ltd.’s BlackBerry Messenger service as one of the tools that were used by rioters.