Facebook is redesigning the navigation on its mobile app to prioritize the services you use most frequently.
The navigation bar, which spans the bottom of the screen on the iOS app and the top on Android, previously showed every user in the same country the same five icons. For example, in the US, it was the News Feed, notifications, menu, Watch, and Marketplace. According to CNET, with this update, everyone will still see the News Feed, notification, and menu icons, but the other slots will be replaced with icons for what you use the most, like links to your profile, friend requests, or groups. The app will shoot you an alert when one of these new shortcuts is added.