Hampshire Police said two people were arrested on Wednesday evening over messages sent via the Twitter website, and a third on suspicion of using the Blackberry Messenger Service (BBM) to incite violent disorder.
It found that, even in the wake of the summer riots, as many as a third of people who regularly use services such as Facebook, Twitter or BlackBerry Messenger appeared not to realise that posting a message openly organising a looting spree is illegal.