The Linux Kernel and Firefox (mentioned earlier) are not really good examples. I would put those in a single repository as I would imagine most people would. B

The Linux Kernel and Firefox (mentioned earlier) are not really good examples. I would put those in a single repository as I would imagine most people would. But a whole company as big as FB and Google using a single tree seems like an incoherent nightmare without proper (somewhat proprietary) tooling (filtering of logs, branches, tags, etc).