Google, Facebook, and Twitter all use monolithic repos (I'm taking monolithic to mean 50+% is in one repo, not necessarily everything in one repo), so no, not j

Google, Facebook, and Twitter all use monolithic repos (I'm taking monolithic to mean 50+% is in one repo, not necessarily everything in one repo), so no, not just Facebook. I'm going to assume there are very good reasons for doing so (and there are - you can look up past discussions on HN).