Justin Trudeau, Canada's prime minister, left, and Sheryl Sandberg, chief operating officer of Facebook Inc., take part in a panel session during the World Economic Forum (WEF) in Davos, Switzerland, on Friday, Jan. 22, 2016. World leaders, influential executives, bankers and policy makers attend the 46th annual meeting of the World Economic Forum in Davos from Jan. 20 - 23. Photographer: Matthew Lloyd/Bloomberg via Getty Images
