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Recently, Facebook paid a whopping $19 billion to acquire WhatsApp. Currently a messaging application, WhatsApp is looking to implement voice over internet protocol (VoIP) by June of this year. A prime example of the growth and prosperity of VoIP in the business market today, WhatsApp already has 465 million users - all of whom will be able to make VoIP calls after WhatsApp releases an update by the second quarter of the year.