Career site Glassdoor today released the results of its annual CEO approval rating survey, showing a four percentage-point drop for Apple CEO Tim Cook that resulted in a decline from the top spot in last year's survey to 18th in this year's version. Glassdoor's results are based on over 500,000 company surveys submitted by employees over the past year that ask whether they approve of how their CEO is running the company. Based on an average of ratings over the past year, Cook dropped from a 97% approval rating in the 2012 survey to a 93% rating this year. Facebook's Mark Zuckerberg surged to the top of this year's list, seeing a 14-point ri
