450,000,000 is the number of monthly active users WhatsApp has worldwide, which means Facebook paid $42 per user to acquire the tech startup. According to The Guardian, when the deal closes, Facebook will own four of the world’s most popular smartphone apps: Facebook itself, Instagram, WhatsApp and Facebook Messenger.
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(This story appears in the 21 March, 2014 issue of Forbes India. To visit our Archives, click here.)