Musk, Zuckerberg among America's top 10 highest rated CEOs

Aerospace startup SpaceX's Elon Musk and Facebook's Mark Zuckerberg have been ranked among the top 10 CEOs in US with highest ratings in terms of employee approval, according to Glassdoor. Apple's Tim Cook saw his rating slide from 8 to 53. Uber's Travis Kalanick, who has resigned, saw a big drop in popularity and didn't even make the top 100.