Easy online ordering may also be helping. Paul Westra, an analyst at Stifel, said in a note to clients that Domino's is in the "forefront" of how Americans want to order and pay for food. Beginning last month, for example, customers could order a pizza through Facebook's Messenger app. Before that, users could text or tweet a pizza emoji to Domino's to send in their order. In April, it launched a no-click smartphone app that automatically orders when the app is opened.