Changes for users of Facebook messenger on their phones.
Facebook said that if people using droids, iPhone and Windows phones, want to continue to message their friends on Facebook - they'll have to download the standalone app.
Facebook says it wants to "avoid confusion" by making users open two apps. 12 billion messages are sent on the platform every day. If you use an iPad, Mobileweb, Windows Phone or desktop, you won't have to download the app.