Yahoo surprised the world by announcing that they have hired Google executive – and Google CEO Larry Page’s ex – Marissa Mayer, making her Yahoo’s 5th CEO in as many years. This move puts Mayer, 37, among the tech business female elite, with the likes of Facebook COO Sheryl Sandberg, and Hewlett-Packard CEO Meg Whitman. Perhaps the most surprising aspect of this move is Mayer’s young age and lack of experience for such a big undertaking.