That they were found guilty is not too much of a surprise. But that the offenders got 4 years of imprisonment is disproportionate and thus unfair, defeating the purpose of sanctions.
see also the Guardian article ” Facebook riot calls earn men four-year jail terms amid sentencing outcry” 16 August 2011
Hopefully, the idea to ban use of social media was dropped after a meeting with the industry. “Home Office meets social networks over blocking plans” ZDnet.co.uk 25 August 2011