Now Playing: 3-4-13 Marketplace Tech: A status update on women in tech

Our focus this week is women in tech and in recent days some of Silicon Valleys most powerful have been making headlines. The CEO of Hewlett Packard, Meg Whitman, leading her company's backing of same sex marriage. Facebook's Sheryl Sandberg has her new book on sparking a social movement in tech. And there's Yahoo's boss, Marissa Mayer, with a controversial ban on employees working from home. To start the week, Marketplace's Silicon Valley reporter Queena Kim gives us an overview.