Deals: What if Facebook merged with Amazon.com?FANTASY M&A —The buzz is all about Microsoft, or possibly Google, taking a stake in Facebook, the popular social network, at a lofty valuation as high as $15 billion. But the logic of those deals is driven by advertising — the more targeted, the better. But what, exactly, are advertisers hoping to target, and why? Besides crude demographics and geographies, the most logical hooks for ads are Faceb
