Your smartphone is the scourge of restaurants. Customers snapping photos of food and dawdling on Facebook at meals have slowed down table service by an hour over the last 10 years, as an anonymous poston Craigslist’s “rants & raves” section recently alleged. The writer claimed that his restaurant, located in Manhattan’s Midtown East and serving “both locals and tourists,” had studied security footage from July 2004 and compared with a tape of a recent Thursday this month. The takeaway: Today’s technologically distracted diners take longer to order, longer to eat, and longer to pay, and then they blame the restaurant for the wait! “We are grateful for everyone who comes into our restaurant,” the aggrieved restaurateur wrote, “but can you please be a bit more considerate?”