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In an exclusive ITV interview, the family of Fusilier Lee Rigby say they feel 'let down' after the release of the long-awaited report on his murder.
The soldier from Middleton was killed by Michael Adebolajo and Michael Adebowale in Woolwich last year.
While the intelligence services escaped major criticism, the report did find failings by a website operator used by one of the men.
Rob Smith reports.
The Prime Minister says he will meet Fusilier Rigby's family if they wanted to see him.
The family's MP Liz McInnes asked for the Prime Minister to "arrange a meeting with them if necessary" and to "endeavour to ensure that all their questions are given full answers".
Mr Cameron said: "A police liaison team is still working with the family, and they should know that whatever meetings they want, they can ask for and they will get."
In a statement, a Facebook spokesman said: "Like everyone else, we were horrified by the vicious murder of Fusilier Lee Rigby. We don't comment on individual cases but Facebook's policies are clear, we do not allow terrorist content on the site and take steps to prevent people from using our service for these purposes."
The Community Standards page of the social network's website has a section dedicated to violence and threats. It says: "Safety is Facebook's top priority. We remove content and may escalate to law enforcement when we perceive a genuine risk of physical harm, or a direct threat to public safety.
Facebook hosted an exchange between Michael Adebowale and an overseas extremist ahead of the murder of Lee Rigby, ITV News understands.
In the exchange Adebowale spoke of his intent to murder a soldier.
In a statement, a spokeswoman for Facebook said they took "steps" to prevent people using the site for terrorist purposes.
Jeremiah Adebolajo, brother of Michael Adebolajo, has said that the parliamentary report on the 2013 Woolwich attack is 'nothing more than a distraction.'
Prime Minister David Cameron has announced an extra £130 million will be given to security and intelligence agencies.
Mr Cameron said the money would be used to "enhance our ability to monitor and disrupt these self-starting terrorists".
It comes in the wake of a report by the Intelligence and Security Committee into actions by agencies in the lead up to soldier Lee Rigby's death.
Prime Minister David Cameron has said lessons can be learned from a report into actions taken by intelligence agencies in the lead up to soldier Lee Rigby's murder.
Mr Cameron said: "There are lessons to be learned and things that need to change."
The report, by the Intelligence and Security Committee, concluded intelligence agencies could not have prevented the murder of Rigby despite his killers featuring in a total of seven error-filled operations before the attack.
Latest ITV News reports
The family of Lee Rigby say they want to meet the Prime Minister to seek answers about his death.
Facebook stands accused of failing to flag web chat