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For questions specifically about the Facebook Messenger standalone app.

Facebook Messenger is a standalone companion app to that deals only with Facebook messages/chat.

It was originally released in August, 2011. In December, 2012, the app was updated to allow use with only a name and a phone number (to act as a replacement for SMS) in a few countries. It was later updated to allow the app to also act as a SMS client replacement. In April, 2013, coincident with the launch of , the "chat heads" feature was added, which keeps a round icon overlay for a chat conversation active even when using other apps.