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Koum almost immediately chose the name "Whats App" because it sounded like "what's up", and a week later on his birthday, on February 24, 2009, he incorporated Whats App Inc. However, early Whats App kept crashing or getting stuck and 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".In June 2009, Apple launched push notifications, letting developers ping users when they were not using an app.On August 24, 2014, Koum announced on his Twitter account that Whats App had over 600 million active users worldwide.At that point Whats App was adding about 25 million new users every month, or 833,000 active users per day.Facebook, which was advised by Allen & Co, paid billion in cash, billion in Facebook shares, and an additional billion in restricted stock units granted to Whats App's founders (advised by Morgan Stanley), Koum and Acton.Koum visited Acton, who was still unemployed while managing another startup and decided to join the company.After months at beta stage, the application eventually launched in November 2009 exclusively on the App Store for the i Phone.
In December 2009 Whats App for the i Phone was updated to send photos. 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 in 2011 on top of their 0,000 seed funding, after months of negotiation with Sequoia partner Jim Goetz.By early 2011, Whats App was in the top 20 of all apps in Apple's U. As of April 22, 2014, Whats App had over 500 million monthly active users, 700 million photos and 100 million videos were being shared daily, and the messaging system was handling more than 10 billion messages each day.Koum then hired an old friend who lived in Los Angeles, Chris Peiffer, to make the Black Berry version, which arrived two months later.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.
Koum updated Whats App so that each time the user changed their statuses, it would ping everyone in the user's network.Whats App 2.0 was released with a messaging component and the active users suddenly swelled to 250,000.