By Veronika Bondarenko It’s perhaps even more popular than the McRib. Unlike many fast-food chains, McDonald’s (MCD) – Get McDonald’s Corporation Report has a relatively limited lineup of limited-time-offers (LTOs). It has the Shamrock Shake, which comes back every year for Saint Patrick’s Day, and the McLobster, which it releases some years selectively in the northeast. It also has the McRib, a legendary sandwich that gets released selectively every now and then when supplies of the pork that make up the “rib” part of the sandwich become available. People literally follow the McRib on social …