The family of Lee Rigby say they want to meet the Prime Minister to seek answers about his death.
It comes after the security services escaped major criticism in a report on his murder.
The soldier from Middleton was killed by Michael Adebolajo and Michael Adebowale in Woolwich last year.
It has emerged that intelligence teams had monitored both men but that a string of errors were made.
Lee's stepfather, Ian Rigby, said:
Lee Rigby's sister Sara McClure told ITV News, that the report had given her someone to blame, but that that wasn't necessarily what she had been looking for:
Reacting to findings in the report that Facebook had picked up on messages sent by one of the killers, describing his intent to kill a soldier, Lee's stepfather said more should be being done to police social media.
He said: "There was a situation where an account was closed because of the content of that message. They [internet companies] should have a moral to find out why.
"They should have a duty to follow up, and pass it on to someone who can understand that situation and alert the authorities."
Talking about the widespread discussion of what happened to Lee Rigby on that day, and how it happened, Lee's sister said her brother was being 'taken away'.