I smell a trend, and it smells like greasy pepperoni: Pizza chains Domino's and Pizza Hut both put out announcements on Thursday concerning their new social-media publicity strategies. In other words, there are new ways to bring the habit of stuffing one's face with mediocre pizza into one's ever-increasingly digital lifestyle. Pizza Hut, for one, will be giving away free orders of "Stuffed Pizza Rolls" (Did you just hear that little cry? It was my arteries screaming for mercy at the mere thought of this) on July 4 to its Facebook fans and Twitter followers via a promotional code...