This is a pretty interesting subject so I'll just add another thing.
You'll be surprised how easy it is for someone these days to get money out of you.
If you slander a business and their sales happen to go down as a consequence or on the other hand if you slander a small operator and he decides to stop working due to stress, they can file against you in the Adelaide or Elizabeth Magistrates Court for up to $5000 and serve you the documents personally without it costing them a cent because they wont necessarily need a lawyer for that amount and you don't need to be licenced these days to be a Process Server, anyone can serve you a summons.
Food for thought........