To get the freebie cheeseburger visit the linked McDonalds facebook app, hit submit and it'll produce a customised voucher (?) for you. Print it out and take it with you to the store to claim a freebie cheeseburger on the 26th.
You need to be logged into your FB account on submit so your locked to one freebie unless you have multiple accounts.
Its obvious isn't it..... ! Through Buckscoop Australian consumers can freely share deals, vouchers or promo codes, bargains and freebies they think are worth mentioning. At Buckscoop you're participating in helping others to share in the good deals that you find and of course the share in those others find as well.