There's no question that Facebook only uses RN for part of the main Facebook app. They've been open about the fact that Newsfeed on Android uses Litho rather th

There's no question that Facebook only uses RN for part of the main Facebook app. They've been open about the fact that Newsfeed on Android uses Litho rather than React Native: https://github.com/facebook/litho https://github.com/facebook/litho Ironically, this is because they weren't happy with the performance of native Android components, and that's what React Native uses under the hood.