Move Fast (and Break Things) is the unwritten motto of every mediocre dev shop out there (breaking things being an unintended side effect of moving fast). It's not controversial.
Exactly, it's unwritten because no dev shop would explicitly market themselves as being willing to break things in the name of speed. It's an unfortunate side effect that they don't want to call attention to, whereas Facebook wears it as a badge of honor.
How often do you hear of Facebook going down or breaking completely?
Eventually, users just left twitter and they shut down the site a year later.
This works of course better with exerimental APIs compared to things you have to put on CD and ship.