Butterfinger just hit 730,000 fans and released a $0.10 coupon. As they moved up to 800,000 they will be releasing more coupons for higher values (up to a BOGO at 800k)
Head over to their Facebook Page here to print your $.10 one now (which at your local grocery store that doubles/triples could be pretty good).
Facebook Advertising not only gives you and your business wonderful results, but with it, you can only advertise to people who are interested and willing to buy your products. Additionally, you can also target the gender, age, and location of your clients or customers.