A MAGISTRATE has warned online trolls the "heavy hand of the law will come down on you'' if disturbing material is posted on social networking sites.

Jessica Chantelle Cook, 22, pleaded guilty in the Gympie Magistrates Court today to one count of using a carriage service to menace, harass or cause offence.



The Gympie shop assistant was charged by police in July after she posted hateful comments and crude photographs on a Facebook tribute page set up in the memory of slain Sunshine Coast woman Justine Jones.



Ms Jones, 22, from Alexandra Headland, was murdered last month and her body was found dumped at the Nambour rubbish tip.



Magistrate Maxine Baldwin described Ms Cook's actions as "appalling, incomprehensible and absolutely sickening.''



She posted offensive pictures including a headless corpse and a vagina on to Ms Jones's Facebook tribute page.



The court heard Ms Cook created a fake profile and disguised herself by going online under the name Wendy Woods.



Prosecutor Jason Todman told the court Ms Cook was one of the site's administrators and posted "disturbing material" on the memorial page.



He said Ms Cook boasted online that her actions had gained media attention.



Prosecutor Todman told the court Ms Cook wrote: "I got a story in the local paper today, all my hard work has paid off.''



Ms Cook's lawyer, Michael Connolly from Connolly Dore Lawyers, said his client was picked on as a child and suffered mental health problems.



He said she used the internet "as a way of venting her frustrations.''



"She started trolling to get her point of view across but obviously it got out of control,'' Mr Connolly said.



"She has no desire to start trolling again.''



Mr Connolly would not confirm whether his client knew Ms Jones.



The court heard Ms Cook was diagnosed with attention deficit hyperactivity disorder (ADHD) at a young age, bipolar disorder and also suffered depression.



Magistrate Baldwin told the court she could not "even begin to put myself in the shoes of those families'' hurt by Ms Cook's actions.



She described it as a "sick sense of fun'' and said told Ms Cook she could not make fun of other people's losses.



Ms Cook fought back tears as she was given a three-month suspended sentence.



If she reoffends she will have to forfeit $3000.



She was released on a three-year good behaviour bond, two years probation and was banned from using social networking sites including Facebook, MySpace and Twitter.



She will also have her laptop computer returned to her after all inappropriate material is removed by Queensland Police.



Richard Peter Coburn, 26, from Sippy Downs has been charged with the murder of Ms Jones and remains in custody.







