Facebook is losing two more key executives amid its privacy and encryption push. Chief Product Officer Chris Cox and WhatsApp head Chris Daniels are both leaving the company. The two are long-time Facebook veterans described as trusted lieutenants of Mark Zuckerberg. The departures come around a week after the company announced sweeping changes to refocus the social network. The cofounder of Instagram and the CEO of WhatsApp are also among the senior executives who have left Facebook in recent months.