<p>Facebook: has a rule that under-13s are not allowed to have profiles. Photograph: Paula Solloway / Alamy/Alamy</p><p>Facebook has admitted that there is almost nothing it can do to stop young users setting up profiles and potentially being exposed to explicit content, online bullying and grooming.</p><p>The world's biggest social network has a rule that under-13s are not allowed to have profiles and also has strict rules for policing explicit content and preventing bullying and grooming.</p><p>However, there is no stringent verification system to prove the age of Facebook users and some research estimates a third of 9 to 12-year-olds in the UK have a profile on the social network.</p><p><a href="http://www.guardian.co.uk/technology/2013/jan/23/facebook-admits-powerless-young-users">Keep reading...</a></p><p>Read also:</p><p><a href="http://www.insidermonkey.com/blog/facebook-inc-fb-admits-it-cant-stop-youth-profiles-42481/">Facebook Inc. (FB) Admits It Can't Stop Youth Profiles</a> (Insider Monkey (blog))</p><p>Explore: <a href="http://news.google.com/news/more?ncl=d86qdRHvIZmhzzMEvVcEBXnUlsJ2M&ned=us">2 additional articles.</a></p>