You know Facebook, right? Sheryl Sandberg works here at Facebook as its COO. Apart from Sheryl being a COO, she is also an accomplished author, and IT expert, and the owner of Leanin.org. Her net worth is a staggering $1.53 billion. Her 2017 book titled Option B: Facing Adversity, Building Resilience is a #1 New York Times Best Seller and was named a Best Book of 2017 by Barnes & Noble and Amazon.