The company was later acquired by social media giant Facebook in 2014 for massive 19 billion dollar. WhatApp messenger which was earlier started by two Ex Yahoo employee called Brian Acton and Jan Koum back in 2009 to make the communication simpler has become one of the largest cross-platform instant messaging app by today. The most awaited WhatsApp video calling feature has finally arrived and its available for the users to download from respective app stores.