Sheryl Sandberg And Marissa Mayer: How They Differ

The last half century has seen many feminist icons, from the disaffected 1960s housewife (Betty Friedan) to the ferocious lawyer-warrior (Catherine MacKinnon) and the short-skirted, brilliant journalist (Gloria Steinem). But it's telling of our times that the two most high-profile and provocative megaphones for women today are both business executives at technology firms.

Facebook COO Sheryl Sandberg, 43, and Yahoo CEO Marissa Mayer, 37, have dominated the media in the last few weeks, Mayer because of her controversial ban on Yahoo employees working from home, and Sandberg because of her new manifesto for young women, "Lean In."