You don't need to wonder, they've said it. http://www.quora.com/Quora-Infrastructure/Why-did-Quora-choose-Python-for-its-development http://www.quora.com/Quora

You don't need to wonder, they've said it. http://www.quora.com/Quora-Infrastructure/Why-did-Quora-choose-Python-for-its-development http://www.quora.com/Quora-Infrastructure/Why-did-Quora-choo... Facebook is stuck with PHP for their legacy codebase, but you'll note they avoid it for new code that isn't tied to the existing codebase.