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Many products at Facebook use Flux—naturally, since Flux was invented here internally :)

Redux has started gaining some adoption as well. As far as I can tell, it's being used in a few dozen places, including a new implementation of the blue navigation bar that we've been testing.

Teams at Facebook can use whatever tech they want to use. Some internal projects use Redux. I think some parts of Facebook.com website also started to use it but those are subject to change because sometimes people want to customize it for their needs, or might replace that version of the product code with something else altogether. Don't forget Redux is super tiny so adding or removing it is not a huge deal.