WASHINGTON: Researchers have identified six different types of killers who turn to Facebook to lure their victims. The researchers analyzed cases of homicide in which the social networking site had been reported by the media as a significant factor.

The researchers found 48 cases of "Facebook murder" from around the world between 2008 and 2013 and identified six different types of killers. They are reactors, informers, antagonists, fantasists, predators or imposters.

A reactor reacts to content posted on Facebook by attacking the victim face to face, researchers explained. This may be immediately after viewing the content that makes them angry or there may be a time delay in which they revisit the content and ruminate over its meaning.

The informer uses Facebook to inform others that they intend to kill the victim, that they have killed the victim, or both. Informers use Facebook as a way of demonstrating their control over the victim and the situation.

An antagonist engages in hostile exchanges on Facebook that escalate into face-to-face fatal violence. A fantasist uses Facebook to perform or indulge in a fantasy. For fantasists, the line between fantasy and reality has become increasingly blurred and the homicide may be a way of maintaining the fantasy or preventing others from discovering the deception.

A predator creates and maintains a fake profile to lure a victim. They may draw upon the information available on the victim's profile to exploit vulnerabilities to establish grounds upon which to develop a relationship.

An imposter posts in the name of someone else. This could be the victim in order to create the illusion they are still alive or another person to gain access to and monitor the victim's profile.

"We had been coming across references to 'Facebook Murder' in the media but there had been no research in this area," said lead researcher Elizabeth Yardley from the Centre of Applied Criminology at Birmingham City University.

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