Social network sites can leave one vulnerable to being humiliated in a public sphere by people unknown to the user.
For cyber bullies, it is a bit of fun, but for the victims it can have a devastating psychological effect.
A recent study has put Australia as the world's worst for online bullying on social networking sites.
One in four Australian students have experienced cyber bullying, a constant barrage of online threats or taunts.
Last May, the state of Victoria criminalised online harassment, after a number of suicides of youths were linked to cyber bullying.
But with no convictions so far, some accuse the police of not taking the crime seriously.
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