"We asked Facebook to take the button in the same way as Bebo, and AOL, MSN and others had and put it into their environment so that children could report to us when there were afraid in the online environment. They chose not to do that," said CEOP head Jim Gamble.
Ashleigh Hall's mother, Andrea, has taken up the cause to protect young users from predators on social networking sites so that no other families go through what the Halls did.
"All the other sites have got it on. So why hasn't Facebook got it on?" she said.
Facebook declined "Nightline's" request for an interview, but sent a statement by e-mail: "Our experience affirms there is no single answer or silver bullet that makes the Internet or Facebook safer. We think the investments and partnerships we announced earlier this week in the U.K. will transform social networking safety and security... We look forward to rolling out similar programs around the world."
Parry Aftab, an Internet safety expert and adviser to Facebook, said she believes the social networking site is doing all it can. The rest, she said, is up to users.
"Bottom line: it's making sure the information users need to keep themselves safe is there and they know when to reach out to law enforcement and get help," Aftab said.
Police who investigated Ashleigh Hall's murder agree that users must be aware and make wise choices.
"Our message is: do not meet people that you've only met on social networking sites," said Andy Reddick, chief superintendant of the Durham police. "But I'm also a realist. I know what people will still go on and do that. So there's preventative messages that you need to listen to and that is: If you're going to meet someone, tell someone where you're going to meet them, tell them who you're going to meet and only meet them in very, very public places."