Late Friday, The Verge spotted the first move toward Facebook's unified messaging utopia Facebook Messenger is taking over Instagram messaging.Facebook Messenger is the second biggest service in Statista's list, with 1.3 billion users, followed by China's WeChat app, with 1.2 billion users.
In a statement to The Verge, Facebook said, A small set of people were able to update to a new test experience for Instagram messaging.
The world's biggest messaging app is Facebook's WhatsApp, with around two billion monthly active users, according to Statista.
The next big move for Facebook will be merging WhatsApp and Facebook Messenger, which would create a 3.3 billion user super network, accounting for about 43 percent of the world's population on a single messaging service.
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