Messenger's new update adds a new ellipses icon to the chat bar above the keyboard. Tapping on this button will bring up a list of apps currently supported by Messenger. Tapping "Install" on any of the apps from the list will directly install it onto the user's device.
What's nice about the update is that it allows Facebook Messenger to support things like animated GIFs, with apps like Giphy. GIFs usually take up a ton more space than photos, so sending them to friends over WiFi is very welcomed.
