WhatsApp Inc., was founded in 2009 by Brian Acton and Jan Koum, both former employees of Yahoo!
WhatsApp Open Source software, WhatsApp follows a 'store and forward' mechanism for exchanging messages between two users. When a user sends a message, it first travels to the WhatsApp server where it is stored. Then the server repeatedly requests the receiver acknowledge receipt of the message. As soon as the message is acknowledged, the server drops the message; it is no longer available in database of server. WhatsApp server keeps the message only for 30 days in its database when it is not delivered (when the receiver is not active on WhatsApp for 30 days)
WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Windows Phone, Android and Nokia.
On February 19, 2014, months after a venture capital financing round at a $1.5 billion valuation, Facebook announced it was acquiring WhatsApp for US$19 billion, its largest acquisition to date.
WhatsApp was officially made available for PCs through a web client, under the name WhatsApp Web, in late January 2015
As of today, one billion people are using WhatsApp. That's nearly one in seven people on Earth who use WhatsApp each month to stay in touch.
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