Australians are renowned for their relaxed and carefree attitude towards life, and this is very evident in their social conventions. Greetings are informal (the classic G'day is a favourite!) and to the point - they are known for not beating around the bush.
Australians have a very good sense of humour, which often involves teasing and jibing. This is not to be taken offensively, but rather as a compliment to your character.
Australian is a society that prides itself on its equality. Everyone is on the same level, and everybody is treated as an equal. No status is bestowed on anyone as a result of their financial situation, religion, gender or race. Although the differences are recognised and celebrated, they do not place any one person above the next - this is a very important aspect of Australian society.
If you find yourself drinking with a group of Australians, it is customary to 'shout a round', which means buying a round of drinks for the people you are with. Everyone else will do it, and it is important in reinforcing the equal footing amongst everyone in the group.
As in most societies, if there is a number of people waiting for the same service, then it is customary to form a queue on a first come first served basis. Pushing to the front of any queue is considered exceptionally bad manners.
When driving your campervan through the outback or through the countryside where there are very few vehicles, cars that are passing in opposite directions normally acknowledge each other with a wave. Australians are a friendly people who encourage all forms of social interaction, even if it is just a wave from a vehicle.