A veteran of Google, Levi's, Apple and GM, Brian Irving will report to CMO Jonathan Mildenhall.
Facebook has launched the Atlas advertising platform, which the social network says will "tackle today's marketing challenges".
Alison Lewis will leave business.
Unilever has confirmed that high-profile marketer Marc Mathieu, who joined Unilever in 2011, is leaving the business to join tech giant Samsung.
European online director said brands must keep their virtual worlds clean and clutter-free.