"Happy to make it to the very exclusive Android 1 billion+ downloads club," the head of the Messenger team David Marcus said in an online post.

A chat forum on Messenger's page at Google Play was rich with accolades but peppered with comment that the high download count was driven by Facebook spinning the widely used service out of the social network, compelling people to get the app.

Facebook last year broke off Messenger from the main Facebook application for mobile users, creating a separate platform that claims more than 600 million users.

Facebook in April began rolling out video calling on its Messenger mobile application, enabling face-to-face conversations among users of the app around the world.

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