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Note that Facebook is trying to scale a single large repository, not an army of slightly smaller ones. It's a very different problem, and has to be solved in a very different way.

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I have seen presentations mentioning google development done as a single monolothic repository

http://www.infoq.com/presentations/Development-at-Google

This monolithic repo isn't a git repo.

Correct. See https://news.ycombinator.com/item?id=7020859

Android is only split up into smaller repositories because git can't handle having it all in one.

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