Dunkin' Donuts is engaging mobile users by inviting them to submit photos of subpar homemade sandwiches via Twitter and Instagram to have a chance at winning mobile gift cards. The campaign promotes Dunkin' Donuts line of bakery sandwiches. "By allowing our fans to send us photos of their sandwiches that 'just didn't cut it' through both Twitter and Instagram, we're opening up another stream of communication that is widely used and will provide us with an additional portal to entry," said Scott Hudler, vice president of global consumer engagement at Dunkin' Brands.