WhatsApp now has 2 billion monthly users, up from 450 million users when it was acquired by Facebook for $22 billion roughly six years ago. The last time Facebook gave an updated user metric for WhatsApp was two years ago, when it announced 1.5 billion users. Within its parent company’s portfolio, WhatsApp is second in size only to the main Facebook app, which boasted 2.5 billion monthly users...
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