WhatsApp Messenger is a proprietary, cross-platform instant messaging subscription service for smartphones. In addition to text messaging, users can send each other images, video, and audio media messages as well as their location using integrated mapping features. The client software is available for Google Android, BlackBerry OS, Apple iOS, selected Nokia Series 40, Symbian, selected Nokia Asha platform, Microsoft Windows Phone and BlackBerry 10. WhatsApp Inc. was founded in 2009 by Americans Brian Acton and Jan Koum (also the CEO), both former employees of Yahoo!, and is based in Mountain View, California. The company employs 55 people.
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