Zuckerberg's New Secret Weapon for Deal-Making: WhatsApp

A visitor tests a Samsung Gear VR virtual reality headset, developed jointly by Oculus VR Inc. and Samsung Electronics Co., in Berlin on Sept. 5, 2014. Photographer: Krizstian Bocsi/Bloomberg

As anyone who's worked with Mark Zuckerberg can attest, Facebook is always his preferred communication app. But when Zuck began exploring a deal to buy Oculus VR earlier this year, he went with an alternative.

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