McDonald's is facing a class-action lawsuit that accuses the fast-food giant of deceiving customers about what meat is used in its McRib sandwich.  The lawsuit, filed by four plaintiffs in U.S. District Court for the Northern District of Illinois last week, alleges that the McRib "does not contain any actual pork rib meat at all," despite its advertising.McDonald's says the claims are "meritless." In the suit, the plaintiffs argued that "despite its name and distinctive shape—its meat patty has been deliber ...