WhatApp's user growth has been nothing short of impressive. Currently the messaging app has more than 450 million active users per month, up from just 200 million in April 2013. Moreover, WhatsApp handles more than 50 billion messages per day, which indicates extraordinarily high user engagement.
With a total value of $19 billion, the deal dwarfs other high-profile tech takeovers, such as Google's recent acquisitions of Motorola or Nest. Google reportedly had a $10 billion bid for WhatsApp rejected and probably won't be too happy about the messaging giant falling into the hands of Facebook.