I believe the majority of the main Facebook app is still "real" native code. It's certainly possible to use any native API you like when using React Native. Yo

I believe the majority of the main Facebook app is still "real" native code. It's certainly possible to use any native API you like when using React Native. You can easily write a modules to bridge to native APIs, but you need to be comfortable to drop into native code when required and do that work for both android and iOS. If you don't feel able to do that, you'll be limited to the libraries that others have already written. It's not hard to do though.