http://www.guardian.co.uk/media/2011/aug/15/essex-water-fight-blackberry-messenger?INTCMP=SRCH
A 20-year-old man from Colchester was arrested on Friday after Essex police discovered his plans to have a water gun battle circulating on the BlackBerry Messenger service and Facebook. He has been charged under the Serious Crimes Act.
An anonymous police spokesman declined to disclose whether Essex police had been monitoring the service since the riots. "Essex police use appropriate measures for whatever the crime and wherever our investigations lead us." Prime Minister David Cameron had said the government is determining if social-networking sites should be shut down because they help to plot crime.