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Comment by wg0 | Hacker News Reader

Why they wouldn't use React Native?

  * Facebook Messenger came out on Android in 2011 [0]
  * React Native came out in 2015 is written in C++, Java, JavaScript, Objective-C, Kotlin [1]

So, even if they did use React Native, they still have 4+ years of code in the original language; and, React Native doesn't stop the use of Java

Most importantly, why was Threads not written in React Native?

Because Instagram wasn't, and Threads is pretty much a copy pasted Instagram codebase (for good reasons).

I'm pretty sure wg0 was being facetious.