Mark Zuckerberg fires back at Tim Cook's 'extremely glib' criticism of Facebook

The gloves are coming off.

Mark Zuckerberg publicly responded Monday to Apple CEO Tim Cook's harsh criticism about the way Facebook handles the private information of its users. He called Cook's argument "extremely glib."

The tiff between two of the most powerful men in Silicon Valley started last week when Cook was asked what he would do if he were Zuckerberg in the wake of the Cambridge Analytica scandal. He responded with a curt answer: "I wouldn't be in this situation."