Mark Zuckerberg has lost two of his closest lieutenants in a major setback for Facebook as it seeks to shift its strategy towards private messaging.
Chris Cox, the social network’s head of product, and Chris Daniels, who ran the WhatsApp messaging service, have both decided to leave Facebook, Mr Zuckerberg announced on Thursday.
The departures follow the resignations of Instagram founders Kevin Systrom and Mike Krieger and WhatsApp’s co-founder Jan Koum last year.
However, the latest exits are potentially more troubling, as Mr Cox and Mr Daniels were members of Mr Zuckerberg’s tight-knit group of allies.
Mr Cox was one of Facebook’s first software developers and one of the chief architects of the news feed, the cascade of Facebook posts that is the company’s most lucrative source of advertising.