Attempts to blame Facebook for the murder of Lee Rigby have attracted condemnation and derision amid concerns that the Government is using its "Counter-Terrorism Awareness Week" to push the UK towards more draconian communication laws.

Senior parliamentarians faced a civil liberties backlash for clearing the security services of any blame for the killing of Fusilier Lee Rigby but urging internet companies to take tougher action on extreme content, after an official report revealed details of online messages sent by one of the killers....