WhatsApp

WhatsApp Messenger is a proprietary cross-platform instant messaging client for smartphones. It uses the Internet to send text messages, documents, images, video, user location and audio media messages to other users using standard cellular mobile numbers.

As of February 2016, WhatsApp had a user base of up to one billion, making it the globe's most popular messaging application.

WhatsApp Inc., based in Mountain View, California, was acquired by Facebook Inc. on February 19, 2014, for approximately US$19.3 billion.

Available for Android, iOS, Nokia s40, Symbian, Blackberry, Windows Phone.

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