Dark Facebook is an application developed by Nate River. Many applications today like Twitter have Dark Mode to make it more visually appealing or to not hurt your eyes when trying to use your phone at night. Unfortunately, Facebook hasn't fully rolled out Dark Mode to everyone but the application Dark Facebook is a good way to get around that. By using Dark Facebook, you'll instantly have Facebook and Messenger switch to the dark theme that you're looking for. It should be noted though that you'll have to completely reinstall both the Facebook and Messenger applications to get Dark Facebook to work. Overall, Dark Facebook might be a bit of a pain to set up on your Android device but it can be well worth your time if you are someone who really likes a dark mode implementation on their applications.