For $44 billion, Microsoft could buy every Silicon Valley and Silicon Alley venture-backed start-up in existence. That includes Facebook at $15 billion. It includes Slide, RockYou, and every other elemental company. It would be a Moe Green kind of scene like at the end of the Godfather when Michael Corleone takes out all the heads of the five families. It would turn Microsoft’s Internet business around overnight. It would be the ultimate coup.