Messenger is a mobile messaging app that lets you reach people instantly on their phones. With Messenger you can send private messages and stickers, chat with groups, and make free calls, even to people in other countries. You can also see who's available on Messenger and who's active on Facebook. Messenger is available on Android and iOS.
Introduced: August 2011
Testing A New Messenger Experience on Android
Building a faster Messenger
More about Messenger