A new study of U.S. adolescents provides some of the best evidence to date of how violence spreads like a contagious disease.
Researchers found that adolescents were up to 183 percent more likely to carry out some acts of violence if one of their friends had also committed the same act.
But the spread of violence doesn’t just stop at friends – results suggest the contagion extends by up to four degrees of separation – from one person to a friend, to the friend’s friend and two more friends beyond.
Results showed that participants in the study were 48 percent more likely to have been in a serious fight, 183 percent more likely to have hurt someone badly, and 140 percent more likely to have pulled a weapon on someone if a friend had engaged in the same behavior.
This study is the first to show how far violent behavior may spread within a social network, Bond said. The findings showed that the influence of one person’s violent act can spread up to two degrees of separation (friend of a friend) for hurting someone badly, three degrees (friend of a friend’s friend) for pulling a weapon on someone, and four degrees for serious fights. The influence declines with each degree of separation, but is still noticeable.
Researchers think that one important factor of this study could be to demonstrate the value of anti-violence programs.