Every time users place an order at Pizza Hut's website they receive two virtual slices - one for the user and one for a friend on Facebook.
When users collect four virtual slices, they get one free real pizza from Pizza Hut.
Pizza Hut Australia marketing director Valerie Kubizniak said: 'Pizza is the ultimate social food and Facebook is by far the most popular social networking site, so this is a great combination - we want to reward not only our most valued online customers but also their favourite friends on Facebook too.'
'Feed a Friend' follows Pizza Hut's iPhone app, which achieved over 200,000 downloads in the first eight months of launch.
The augmented reality function or 'GPS Store Finder' provides iPhone 3Gs users with the ability to find their nearest Pizza Hut store by utilising GPS technology. People hold up their iPhone 3Gs, the camera opens and the screen shows not only what is in front of the user, but small tabs highlighting the direction and distance of Pizza Hut locations nearby.
According to Pizza Hut, in the coming weeks iPhone customers will also have the ability to customise their pizzas and add their favourite toppings, something that has long been a part of the Dominos iPhone app.