Has there been any successful cases for this in Australia?
I found this one that wasn't.
June 2014
In one of the first cases of its kind in Australia, an eBay seller running a business called "Achilles Archery & Outdoors" sued a West Australian man over a negative review he posted on the auction website, as well as five posts on a separate forum in which the buyer discussed products he had bought from the business
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The case was dismissed on a procedural point by NSW District Court judge Judith Gibson last month, but lawyers predict the number of defamation cases involving online reviews and feedback will grow as people become increasingly aware of their online reputation.
Judge Gibson said "the distress caused to ordinary members of the community who find themselves at the receiving end of proceedings for defamation (as opposed to experienced media defendants) has been the subject of comment" in Supreme Court cases.
"These considerations are even more relevant today, where parties with no prior experience of defamation law, rather than experienced media defendants, increasingly find themselves before the court in complex and expensive litigation," she said.
"Claims for defamation are easy to commence, and difficult to defend."
In the District Court case, the eBay seller did not provide particulars of how he had been identified by the comments and the case was summarily dismissed
Andrew Stewart, a partner at law firm Baker & McKenzie, said another potential obstacle was whether anybody could recognise the plaintiff if they too used a pseudonym.
"It may only be a few people who can recognise the user who is being attacked, if anyone," Mr Stewart said.
"That doesn't mean it's not defamatory but what it means is that because the reputation of the person may only be affected in respect of a small number of people, the damages may be too small to justify suing."
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http://www.smh.com.au/national/negative-feedback-on-ebay-emerges-as-new-defamation-battleground-2014...
