The most concise explanation yet for why Facebook's paying $19 billion for WhatsApp

As I wrote in my post when the news broke, it's all about growth.

Read Parmy Olson's Forbes story out today, which she began reporting long before the acquisition announcement: "The Rags-To-Riches Tale Of How Jan Koum Built WhatsApp Into Facebook's New $19 Billion Baby"

[Via]. [Previously on Boing Boing].