Facebook is on a collision course with David Cameron after it refused to take down a webpage set up in tribute to gunman Raoul Moat.
The Prime Minister earlier condemned those who had shown sympathy for the former nightclub doorman after he shot three people - killing one of them.
A picture of an increasingly paranoid father-of-three has also emerged after it was revealed Moat had recorded himself in talks with social workers and police.
In the tapes, Moat said he wanted to see a psychiatrist in case he had a "problem" and wanted help.
Mr Cameron was urged by a Conservative MP to contact the social networking site to ask it to remove the RIP Raoul Moat group.
And Downing Street indicated that an official was likely to contact Facebook to highlight the Prime Minister's concerns with the company.
During an exchange in the Commons on Wednesday, Mr Cameron said: "It is absolutely clear that Raoul Moat was a callous murderer, full stop, end of story. I cannot understand any wave, however small, of public sympathy for this man.
"There should be sympathy for his victims and the havoc he wreaked in that community.There should be no sympathy for him."
But Facebook refused to take down the webpage saying many people would find some of the topics discussed on the site "distasteful", but added "that is not a reason in itself to stop a debate from happening".
As well as tributes on Facebook, bouquets have been left outside Moat's former home in Fenham, Newcastle-upon-Tyne, while flowers and cards have transformed the riverside in Rothbury, Northumberland, where he shot himself in the early hours of Saturday morning into a shrine.