Sources shed light on the increasingly personal battle between Tim Cook and Mark Zuckerberg, who in private reportedly said "we need to inflict pain" on Apple (Wall Street Journal)

Wall Street Journal:
Sources shed light on the increasingly personal battle between Tim Cook and Mark Zuckerberg, who in private reportedly said “we need to inflict pain” on Apple  —  Animosity between CEOs Mark Zuckerberg and Tim Cook erupts over privacy and dueling visions of internet