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Instagram's Chief Operating Officer Marne Levine is mentored by Facebook's Sheryl Sandberg - a beneficial relationship given their similar career paths. Alison van Diggelen, from the Fresh Dialogues initiative that focuses on inspirational women and business innovation, describes how women can really benefit when they have male champions too and challenges Mark Zuckerberg to ‘step up’. Image: Woman receiving a baton Credit: Thinkstock