Elon Musk REUTERS/Joshua Roberts Americans sit through some 11 million meetings every day — with the unproductive ones costing companies $37 billion a year.

Since we've already looked at the most egregious meeting mistakes, we decided to explore how the most successful executives run effective meetings.

After combing through the business literature, we discovered that Yahoo's Marissa Mayer grills her employees like an expert chef, Amazon's Jeff Bezos can't stand it when people agree, and Facebook's Sheryl Sandberg wields a mighty notebook.