Yahoo co-founder Jerry Yang is about to find out that being a CEO is a lot different than being the ceremonious Chief Yahoo as he was called until last month. Yang who became Yahoo’s new CEO on June 18 faces a daunting to-do list that includes reinvigorating the company closing a performance gap with Google thwarting challenges from social media sites such as Facebook delivering financial results that make Wall Street cheer and charting a course for the future. His first deadline comes in about 100 days. Knowledge at Wharton asked faculty members for advice on how Yang should handle this management challenge.