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"Information about WhatsApp"

The WhatsApp Messenger, or simply WhatsApp, is an American freeware, Cross-platfrom messaging and Voice over Ip service owned by Facebook, Inc. It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, users locations, and other media.
Explainer: What is WhatsApp? -
Its inital release date is on 3 may 2009 and its Developers: WhatsApp Inc. (Facebook,Inc.) or Written in: Erlang or its Owner: Facebook or Original authors: Brian Acton, Jan Koum, Software genre:Voice over IP, Mobile app.
 
WhatsApp is use for:
WhatsApp uses your phone's cellular or Wi-Fi connection to facilitate messaging and voice calling to nearly anyone on the planet, alone or in a group, and is especially nice for families and small collaborative workgroups. The app lets you make calls, and send and receive messages, documents, photos, and videos.

What type of information collect by WhatsApp:
WhatsApp collects information your initally provide to use it. This includes your name and phone number as standard, as well as bonus data you might submit like your email address. It also covers your address book.    

WhatsApp have some disadvantages too:
  • only smartphones are supported, many people still don't have them.
  • There is risk, your spouse/girlfriend/boyfriend may read the messages.
  • It can be annoying sometimes due to constant messages.
Your profile picture is visible to every person having your contact number.
Some of the advantages of using WhatsApp are:
  • WhatsApp is completely free for use.
  • Instantly send message to anywhere in the world.
  • Easy to use, even a novice mobile user can use it.
  • It do not have any advertisements on display screen.
Watsapp calling made it more reliable.

Which  contry mostly use WhatsApp:
India
India has the most WhatsApp users — 400 million.
Brazil also has a lot of users — 120 million. For a country with 210 million people, this is impressive. The countries with the highest market penetration are the Netherlands (85%), followed by Spain (83.1%), and Italy (83%).
How does WhatsApp  earn:
Whatsapp is earning its revenue through two different ways: 1) Subscription Fee: Whatsapp allows it's user to enjoy the services for free for first year. However, after that it charges $0.99 for continued service. But till date, I have not heard of a single person who has paid for this service. 
Why WhatsApp is so popular:
It's become incredibly popular since then, in no small thanks to its features and flexibility. As a free service, WhatsApp allows for messages and calls on both desktop and mobile devices. Part of what makes this app appealing is that it works on various phone and computer operating systems, helping with messaging.
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Location: Maharashtra, India

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