Worldwide, police officers register crimes citing Facebook nearly every 40 minutes, reports UK's newspaper Daily Mail. In total, there are 12,300 crimes registered by the police forces in the whole world which involve the social network platform somehow.
Facebook was cited in allegations related to "murder, rape, child sex offences, assault, kidnap, death threats, witness intimidation and fraud". There also happens to be a large number of crimes involving young children, even though users must say before they join the platform that they are at least 13 years old.
The vast majority, actually, involve young children and teenagers, crimes related to cyber-bullying and pedophiles grooming youngsters. Many allegations of crime via Facebook conducted to "real-life" consequences, such as violence and abused children.
A recent example in Manchester include a 17-year-old teenager who got groomed via Facebook by serial rapist Peter Chapman, after meeting the man in real life, the teenager was forced to have sex with him and then was killed by suffocation.
Facebook has said a few times they cooperate with local police forces in order to bring its social network offenders to justice in real life. The social network claims that such behavior is not accepted not only by the ToS of the site, but also by its administrators.