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by hnbad 1350 days ago
That's pretty much what multiple people working at FB at the time told me over the past years. It was also the conclusion of a third-party analysis of the FB mobile app which literally included multiple libraries for doing the same thing for different parts of the app which were developed by different teams. This was also true for the Facebook web app at least during the early React years.
1 comments

I doubt this is an unusual situation.

I'm not falling on my sword to defend Facebook here, BTW. The company does a lot wrong. I just suspect it's not much worse than anyone else.