A vicious suburban brawl that claimed the life of a mother-of-two was pre-arranged on social media by two warring friendship groups who baited each other into the fight.

Four teenage girls, who cannot be identified for legal reasons, traded the classroom for the courtroom after they brought knives to a brawl in Wollongong on November 22, 2023.

Two of the girls were aged 14 and the other two were 15 when a chat called "The Big Yappers" was created on Instagram to organise a fight with another group of girls, according to the case's agreed facts.

Derogatory comments and threats - including to inflict grievous bodily harm - were made by both sides as they egged each other on in the 24 hours before the fight.

A member of the rival group invited the teens to come to an address in "Lego" - a

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