Social network Facebook has revealed that the Messenger chat app for Android has been downloaded more than one billion times.
The application is part of the home grown service that Facebook offers in its communication network, and the firm said that Messenger has a regular pool of over 600 million users.
The billionth Google Play store download was celebrated with a brief post on Facebook by the company's vice president of messaging, David Marcus, adding a screengrab as evidence.
There was a bad reaction to Messenger last year after users accused the firm of pushing them onto the service at the expense of free choice.
The response, at least outwardly, was negative. The Messenger app had a one-and-a-half star average review on the Apple App Store at the time, from 1,654 reviews. By November the application had 500 million users.
Facebook said that it ships updates to the application every two weeks, and that the software is designed for a single purpose.
"Messenger was the first of our standalone apps and, unlike our core Facebook apps, it focused on one use case: messaging," the firm said last year.
"With Messenger you can reach people instantly. It is just as fast as SMS but gives you the ability to express yourself in ways that SMS can't."
Facebook added a video calling feature to the system this year, as well as Internet of Things features and a developer-pitched Messenger platform, plus a more business-focused chat service.
"Video calling will expand Messenger's real-time communication features, enabling the more than 600 million people who use Messenger every month to reach others wherever they are and from anywhere," the company said.
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