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I don't know about Google, but I believe Facebook keeps all of its code in one gigantic Mercurial repository.

• jordigh 11y ago
  Not exactly "all", but certainly the mother load.
  • digitalsushi 11y ago
    Mother lode, the central, most valuable vein of buried gold.
    • jordigh 11y ago
      Oh, thanks! I'll let my original spelling stand as a testament to my ignorance. :-)