Was it a burger detente for global non-violence, or a cynical bit of jiu jitsu? Burger King, in a "New York Times" ad and a microsite, proposed a one-day mashup on Sept. 21 — Peace Day — whereon it and McDonald's would open a pop-up store in Atlanta, halfway between Miami, where BK is based, and Oak Brook, Ill., home to McDonald’s. McDonald’s shot it down in a pithy tweet. Communications pro Mark Borkowski weighs in.