One voucher download for a free Kit Kat 45gm per Facebook account per day, plus one download from an invite possible per Facebook account per day. Promo ends midnight 27 May, 2012 or once 100,000 vouchers have been downloaded, whichever comes first. One voucher per store per day can be redeemed until 11:59 AEST 31 May, 2012. There is no cost to download these vouchers.