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With a little help from brands McDonald’s, Johnson & Johnson, Hilton, Coca-Cola and Anheuser-Busch, NBC Universal is 85 percent sold out of its expected inventory of ads to play at the beginning ofOlympics Web videos. All of the ads will be 15- and 30-second "prerolls" — because that's the only kind the International Olympic Committee currently allows. Hate prerolls? Go ahead and set up your own broadcast, then, bub. (Photo by striatic)