"We are increasingly getting in court instances beginning on Facebook, it is becoming more and more," the judge added.
The judge's remarks came while sentencing 17-year-old Daniel Cannon, who used 'his teeth as a weapon' to bite off a chunk of friend's ear.
The judge hit out over messages posted on Facebook by Cannon's brother, which provoked the attack.
"I had an opportunity to look at the Facebook (comments)- and it can be said that the defendant's brother is responsible for Daniel Cannon being in the dock," the paper quoted the judge, as saying.
"It would have been appropriate if your brother could be in court today. It was disgraceful, pathetic, juvenile behaviour - messages some of which were deeply offensive and of a violent nature," he added.