6. Sheryl Sandberg

What she did: Brought the steadying factor

In 2008, Sheryl joined Facebook as the COO, taking the position which for long had been a wobbling chair. With her rich experience from Google Sheryl started implementing core business plans into Facebook, which was being run by the so called geeks with very less experience in the field of business. The company has recorded considerable improvement since the arrival of their current COO.