Ah, so even the makers of React are not dogfooding it anymore. Sounds about right.
Pretty sure they're using it on web everywhere and IMHO that's a decent choice when you need state management / DOM updates.
React Native is a whole other ball of mud, taking UI decisions out of the main thread where phones want them to be and delegating them into a bolted on javascript environment.
And FB performance degrading every month. I mostly use FB groups.