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Internet jobs site Glassdoor has released its list of the top 50 U.S. CEOs, based on employee feedback, for the past 12 months through February 27. The company asked the question, “Do you approve of the way your CEO is leading the company?” and received more than half a million responses.

The top-ranked chief executive officer this year is Mark Zuckerberg of Facebook Inc. (NASDAQ: FB). Others in the top five are SAP A.G. (NYSE: SAP) co-CEOs Bill McDermott and Jim Hagemann Snabe, McKinsey & Co. CEO Dominic Barton, Ernst & Young’s Jim Turley and Northwestern Mutual’s John Schlifske. Turley is the only repeater in the top five.

Last year’s top-rated CEO, Tim Cook of Apple Inc. (NASDAQ: AAPL), fell to 18th this year, although the decrease in his score was relatively small, from 97 to 93. Larry Page, CEO at Google Inc. (NASDAQ: GOOG), fell from fifth place a year ago to 11th place, but improved his score from 94 to 95.

Glassdoor’s CEO noted:

The CEOs who are most successful in gaining employee approval are those who paint a clear vision of what the company is setting out to achieve and how it’s going to get there. To be recognized by your employees as a strong leader also comes as a result of having a solid company culture that helps employees foster the skills necessary to move business forward and meet the needs of customers.

Glassdoor’s top 50 list is available here.