FORTUNE -- Judging from the sheer volume of commentary generated by Facebook's (FB) $19 billion offer for WhatsApp, it seems everybody in the tech world is having a hard time swallowing the sticker price, even if most of it comes in...
What the $19 billion Facebook just spent has to do with Apple
Think of it, writes Kara Swisher, as the price Facebook must pay for not having a mobile OS.
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