Sheryl Sandberg, Facebook’s chief operating officer, speaks movingly to BBC Newsnight’s Emily Maitlis about the sudden death of her husband Dave Goldberg two years ago.

Together with psychologist Adam Grant she has co-written a book about her experience, Option B: Facing Adversity, Building Resilience, and Finding Joy.

Watch the full interview on BBC Newsnight at 22:30 on BBC Two - or on YouTube