In June 2009, Apple launched push notifications, allowing users to be pinged when they were not using an app.
Koum changed Whats App so that when a user's status is changed, everyone in the user's network would be notified.
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Four-year-old Praveen Kumar left his house in Guntur, southern India, with his sister to play with other children on Thursday, when a pack of dogs attacked him.
The dogs bit the child in the neck, face, hands, chest, shoulders and legs in an attack that lasted more than 30 minutes until he was left in a semi-conscious condition.
Whats App 2.0 was released with a messaging component and the number of active users suddenly increased to 250,000.
Acton was still unemployed and managing another startup, and he decided to join the company.
His parents claimed neighbours heard the attack and ran out but proceeded to film the incident on their phones instead of rescuing the child while he screamed and cried for help.