The following was copied from AirAsia:
Enjoy exclusive discounts just for being an AirAsia Facebook Fan. AirAsia is slashing 20% off when you book your flights from 16 - 20 Dec! Head on to our Facebook Fan Page, Click on Become A Fan, check for Updates in your Facebook Inbox for the exclusive discount code.
so has this worked for anyone? I've just become a fan and wondering when they send the update to your inbox??