Interested in knowing if they're made by native SDKs or React Native or, unlikely flutter. will they do desktop apps? electronjs came to mind for that, yes it'

Interested in knowing if they're made by native SDKs or React Native or, unlikely flutter. will they do desktop apps? electronjs came to mind for that, yes it's fat but it's the only one truly cross platform now. Not a IG, FB, Threads, Twitter user per se, just interested in what stack Meta uses to build Threads, looks like a mix of various pieces from their existing code base to me.