Yes, Facebook Groups for iOS is built in React Native. Unfortunately, it is quite slow. For my startup, I think we'll use React/RN just to get something "nativ

Yes, Facebook Groups for iOS is built in React Native. Unfortunately, it is quite slow. For my startup, I think we'll use React/RN just to get something "native" on mobile, until we can do it proper with Swift/Java when we have time/devs. Comparison, FB Groups app and the regular FB app. Latter way better.