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Re:Buck – A build system developed and used by Facebook by fs111 on Tuesday March 14, 2017 @06:47AM (#13866423)
> At Facebook, everything builds with Buck

Looking at https://github.com/facebook you seem to be using all sorts of build tools...

Re:Buck – A build system developed and used by Facebook by sdwilsh on Tuesday March 14, 2017 @11:56AM (#13868591)
What Facebook uses internally in their monorepo and what they publish to open source for external consumption doesn't have to be the same build tool.

Facebook uses fbshipit (https://github.com/facebook/fbshipit/) to take slices of their monorepo and publish them to GitHub.