!!! Overview
[{$pagename}] is an [Instant Messaging] ([IM]) [service] and software [application]. 

Originally developed as Facebook Chat in [2008|Year 2008], the [Facebook] revamped its [Instant Messaging] service in [2010|Year 2010], and subsequently released standalone [iOS] and [Android] apps in August [2011|Year 2011]. Over the years, [Facebook] has released new [{$pagename}] [applications] on a variety of different [Operating Systems], launched a dedicated [{$pagename}] [website] interface, and separated the [{$pagename}] functionality from the main [Facebook] app, requiring users to use the [web] interface or download one of the standalone [apps].

Users can send messages and exchange photos, videos, stickers, audio, and files, as well as react to other users' messages and interact with [chatbots]. The service also supports voice and video calling. The standalone apps support using multiple accounts, conversations with [optional] [end-to-end Encryption], and playing games.

After being separated from the main Facebook app, [{$pagename}] had 600 million users in April 2015, growing to 900 million in June 2016, 1 billion in July 2016, and 1.2 billion in April 2017.

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