A Youth Court judge has told the victim of schoolyard bullying he has nothing to be ashamed of and can leave the court holding his head high.

Magistrate Garry Hiskey made the comments while sentencing one of the boy's attackers.

"The weak one was the person who hit you without warning. You in fact have been strong. You can leave this court with your head held high," he told the victim.

The case made national headlines when vision of the 15-year-old victim being knocked unconscious by another student at an Adelaide northern suburbs school in February was posted on the internet.

In the same month, another boy assaulted the same victim.

That second boy has now been sentenced to 40 hours of community service.

He has been put on a nine-month good behaviour bond and must write a letter of apology to the victim.

The court heard that boy pushed the victim and posted a threatening message on Facebook after being suspended from school.

The magistrate told the victim he was not a "snitch" or a "dobber" and could leave the court without shame.

"You were asked a question by a teacher, the effect of which is that you saw [the youth] leaving the school grounds. So what? You did not say anything wrong. You did not accuse [the youth] of anything," he said.

"You are not a snitch. You did not dob anyone in. You have nothing to be ashamed of."

Speed of technology

The victim's mother spoke outside court.

"I am impressed with the outcome ... hopefully this sends a message to other teenagers that if you do a crime there is such things as community service, there is such things as bonds. I'm hoping this person will take that seriously," she said.

"This is closure for us. We can walk away from this now. We can close, we can heal, and that means a lot.

"I urge other families to stand up behind their families, behind the people that are bullied; give them all the support they need and stand up. Eventually things will change."

The mother urged more be done to deal with the harm that can be caused on the internet.

"The cyber violence and the cyber bullying really needs to be addressed, the problem being that as technology gets faster they can't keep up the laws to sort of keep it under control. It's the same with mobile phones and video taping," she said.

"They can drive kids to suicide; they can drive kids to depression; they can drive you know other children to take retaliation and assaults can kill.

"There really needs to be a lot more clamping down on these social networks and mobile phone taping. There needs to be very harsh penalties for such things."

The victim of the attack also expressed his relief about the outcome of the case.

"It is a chance for me to move on, yes, because now I know it's all over," he said.

"School is going a lot better for me now since I've moved and I don't have any idiots trying to harass me or anything so it's all good."