The phrase identifies a specific feature related to the Facebook application on Android operating systems: the dark mode setting released in the year 2020. This feature alters the user interface, changing the predominantly white or light backgrounds to darker shades, typically black or dark gray. For example, enabling this feature would transform the standard white Facebook interface to a black interface on an Android device.
The implementation of a darker theme offers several advantages. Reduced eye strain, particularly in low-light environments, is a primary benefit. Battery life on devices with OLED or AMOLED screens can also be extended, as darker pixels require less power to illuminate. Furthermore, the introduction of this feature aligned with a broader trend of dark mode adoption across numerous applications and operating systems, reflecting user demand for customizable and comfortable visual experiences.