This is a contest that I posted a few hours ago, but at the moment it seems that everyone is winning. Follow these instructions to get it:

https://www.facebook.com/snickers/app_506314022815160 or
Send a text message with the word SNICKERS to 78787 and follow the instructions contained in the reply text messages. They will give you a PIN, You must input your Mobile PIN at https://gamedaysatisfaction.snickers.com/