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Dan Abramov's comment elsewhere in this thread says otherwise: "I work at Facebook, and can confirm we keep all code in a monorepo". https://news.ycombinator.

• robrenaud 9y ago
  Unless something drastic changed in the last year, I really doubt it. There is the fb frontend, the backend, the offline batch processing repo, and the instagram frontend repo. I think the phone apps have their own repos too? It was a giant mess, especially when you had to make changes that spanned repos, like introducing a new backend API and then depending on it, or changing logging formats.