I think I see where the confusion is, muzmath said 'a' facebook app (i.e. Ads Manager), not 'the' facebook app. Main FB app is definitely not using 100% react native.
That being said, Ads Manager users are still mostly just "users". I know a middle aged woman using it to manage ads for her side business for example, regular people are using 100% React Native apps daily.
That being said, Ads Manager users are still mostly just "users". I know a middle aged woman using it to manage ads for her side business for example, regular people are using 100% React Native apps daily.