From the article:

> We can be almost certain that React & React Native are a competitive advantage. We can see evidence in how Facebook simultaneously launched Snapchat-like “Stories” across four applications (WhatsApp, Messenger, Facebook, and Instagram) in its product suite.

> It’s not hard to infer that React was a key reason why Facebook was able to do this so rapidly.

Is there any actual evidence that React / React Native was used to build the Stories feature for any of these apps?