WhatsApp Messenger is a proprietary, cross-platform, encrypted instant messaging client for smartphones.It uses the Internet to send text messages, documents, PDF files, GIF images, video, user location and audio messages to other users using standard cellular mobile numbers.
As of February 2016, WhatsApp had a user base of one billion, making it the 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
WhatsApp uses a customized version of the open standard Extensible Messaging and Presence Protocol (XMPP). Upon installation, it creates a user account using one’s phone number as the username.
WhatsApp software automatically compares all the phone numbers from the device’s address book with its central database of WhatsApp users to automatically add contacts to the user’s WhatsApp contact list. Previously the Android and Nokia Series 40 versions used an MD5-hashed, reversed-version of the phone’s IMEI as password,[64] while the iOS version used the phone’s Wi-Fi MAC address instead of IMEI.A 2012 update now generates a random password on the server side
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