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Whats App introduces a feature named Read Receipts, which alerts senders when their messages are read by recipients.
Within a week, Whats App introduces an update allowing users to disable this feature so that message recipients do not send acknowledgements.
After months at beta stage, the application eventually launched in November 2009 exclusively on the App Store for the i Phone.
Koum then hired a friend who lived in Los Angeles, Chris Peiffer, to develop the Black Berry version, which arrived two months later.
By early 2011, Whats App was one of the top 20 apps in Apple's U. Facebook, which was advised by Allen & Co, paid billion in cash, billion in Facebook shares, and (advised by Morgan Stanley) an additional billion in restricted stock units granted to Whats App's founders, Koum and Acton.
At a keynote presentation at the Mobile World Congress in Barcelona in February 2014, Facebook CEO Mark Zuckerberg said that Facebook's acquisition of Whats App was closely related to the vision.
Koum named the app "Whats App" to sound like "what's up".
On February 24, 2009, he incorporated Whats App Inc. However, because early versions of Whats App often crashed or got stuck at a particular point, Koum felt like giving up and looking for a new job, upon which Acton encouraged him to wait for a "few more months".
Whats App, was incorporated in 2009 by Brian Acton and Jan Koum, both former employees of Yahoo! For the rest of the following years Koum relied on his 0,000 savings from Yahoo! In January 2009, after purchasing an i Phone and realizing that the App Store would soon create an industry of apps, Koum started visiting his friend Alex Fishman in West San Jose where the three would discuss "...
Whats App was switched from a free to paid service to avoid growing too fast, mainly because the primary cost was sending verification texts to users.
In December 2009, the ability to send photos was added to Whats App for the i Phone. In April 2011, Sequoia Capital was the only venture investor in Whats App and paid approximately million for more than 15 percent of the company, after months of negotiation with Sequoia partner Jim Goetz.
According to a Tech Crunch article, Zuckerberg's vision for was as follows: "The idea, he said, is to develop a group of basic internet services that would be free of charge to use – 'a 911 for the internet.' These could be a social networking service like Facebook, a messaging service, maybe search and other things like weather.
Providing a bundle of these free of charge to users will work like a gateway drug of sorts – users who may be able to afford data services and phones these days just don’t see the point of why they would pay for those data services.In January 2010, support for Black Berry smartphones was added, and subsequently for Symbian OS in May 2010 and for Android OS in August 2010.