Privacy concerns caused WhatsApp founders to leave Facebook

Mark Zuckerberg wearing a blue shirt before a blue background bites his lips frowning.
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The departures of Brian Acton and Jan Koum, the creators of WhatsApp, from Facebook followed disagreements over how to squeeze more revenue out of the messaging platform using user data — costing them about $1.3 billion, the WSJ's Kirsten Grind and Deepa Seetharaman scoop.

Why it matters: The disagreement stems from WhatsApp's hesitance to monetize using targeted ads — Acton and Koum have notably advocated for user privacy — as Facebook attempts to leverage the service's vast user base to justify its $22 billion acquisition in 2014.