As more and more apps are adding a dark theme, some outliers have started to stand out with their lighter colors and designs. Facebook is one of these, but we've known for a while that the service would soon implement it. It's already rolled it out to the Messenger app, the Facebook website, and is now starting to test it on Android.
Our tipster reported seeing this dark mode on their phone, but it seems like it showed up briefly then disappeared.
Facebook's dark mode on Android starts showing up for some users was written by the awesome team at Android Police.