Foursquare Checkins Get Customers Gas DiscountsMurphy USA, a gas station chain with 1,000 locations situated in the parking lots of Walmart and Sam’s Club stores, announced Wednesday that it’s offering $2 off a $20 purchase of gas with a Foursquare checkin. To sweeten the deal, the chain is also offering a free pack of Stride gum. The chain announced the deal on its Twitter feed and Facebook Page. The offer comes as gas prices have hit $4 a ga
