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Re:Scaling Mercurial at Facebook by skj on Tuesday January 07, 2014 @11:01PM (#7021592)
Go is hosted publicly (on googlecode) and adwords is supersecret or some nonsense and non adwords Googlers can't see it.

But gmail and maps...well, they share a lot of code! For instance, they both run on web servers.

Re:Scaling Mercurial at Facebook by tonfa on Wednesday January 08, 2014 @03:13AM (#7022363)
> adwords is supersecret or some nonsense and non adwords Googlers can't see it

Most code including ads code is readable (and they can propose changes as well) by googlers.