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They wrote about it here: https://code.facebook.com/posts/218678814984400/scaling-mercurial-at-facebook https://code.facebook.com/posts/218678814984400/scaling-

• jcranmer 10y ago
  The big advantage to call out is that they found Mercurial much easier to add extensions to and more receptive to their issues with large monorepos. (For an idea of the scale, Facebook's repository I have heard is ~10× the size of mozilla-central, which is probably the largest public Mercurial repository.)