Two English Facebook users have been jailed for four years for inciting riots more than one week ago.
Jordan Blackshaw and Perry Sutcliffe-Keenan created pages on the social networking site encouraging people to take part in violence.
Only the police turned up to the planned events but judges ruled that tough sentences would act as a deterrent.
The court heard that both men, who are in their early twenties, were previously of good character.
Conservative MPs had urged judges to hand down stiff penalties to those involved in the unrest that swept towns and cities across England.
Civil rights campaigners have condemned the sentences handed to the two men as excessive and disproportionate.