WhatsApp was founded by two Ex-Yahoo employees Brian Acton and Jan Koum in 2009. Both of them were rejected for job in Facebook after they had left Yahoo. Instead of looking for new job they began working on this app. In Feburary 24, 2009 Koum incorporated WhatsApp.Inc in California. The app was not yet launched globally as it required modifications and update to be fully functional. In June 2009, Koum modified WhatsApp to send notification to user’s network as the status is changed.
The popularity for WhatsApp suddenly grew when WhatsApp 2.0 version was released with messaging component.
In November 2009 , the app was finally launched on the App Store for iPhone. In December same year they yet again updated WhatsApp to send photographs. The user base kept on increasing at rapid pace and reached 200 million active users by 2013. In mere 4 years the value of WhatsApp had grown upto $1.5 billion. User base grew upto 400 million by 2013 , which went past 600 million active users by 2014. WhatsApp reached another landmark in 2014 as on February 19, Facebook announced to acquire WhatsApp for US$19 billion.
WhatsApp in India:
WhatsApp in India was launched in mid of 2010 and it soon gained the interest among Indians. With over 70 million active users, which are about 10% of total worldwide users, India has emerged as the largest market for WhatsApp. The no. of WhatsApp users in India is more than any other nation in the world.