Pretty much all tech giants are now incorporating Dark Mode in their apps, services, OS. Apple has introduced Dark Theme on their Mac OS last year, Android followed suit and they Dark Mode is going to be available with Android Q.
The latest company to join the bandwagon is Facebook. As per reverse engineer Jane Manchun Wong, the social media giant is currently working on the Dark Mode for the main Facebook app for Android.
As can see above, the Dark Mode failed to mark its impression throughout the app. This is because we are at a very early stage of development.
Nevertheless, the Dark Mode should arrive in the Facebook app for Android by the end of this year.