a. Whatsapp: Founded in 2009, this Android application has more than 400 million customers in the world. The premise of this application's procedure is simple: it uses the phone number related to your Android device to distinctively identify you on its system. Then, it scans your addresses and provides a list of all users that are signed up with Whatsapp. Apart from sms, users can also send images, video clips and audio messages through the Web. The latest statistics indicate that this messages service handles over ten billion dollars messages through its system every single day.
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