Mark Williams-Thomas, who chronicled his online experienced in a Daily Mail article on Wednesday, has denied to reveal the name of the "well-known social network" site he used, stating it might damage the site's reputation.
He added that the site's operators would be able to identify themselves as the website in the article, so there was no need to make the name public.
A Facebook spokesperson told the Guardian that it was in the interest of young people's safety to identify the site.
"If you really want to protect people online, then you should name sites which allow this. It's up to the Daily Mail and Mark Williams-Thomas. If they really want to protect their readers, they should give the name."
Facebook has threatened to sue the Daily Mail after an article published on Wednesday falsely claimed that teenage girls on the website are likely to be pressured for sex almost instantly after creating a profile.
The British paper apologised for the mistake and issued a correction, but Facebook still fears permanent damage to the social network's reputation.
