You're only as good as your people, or so some leaders are fond of saying. What do Gideon Yu, Ethan Beard, Justin Rosenstein, Ben Ling, Sheryl Sandberg and Elliot Schrage have in common? They all vacated key roles at Google for Facebook. Though it is rumored Ling is returning to work on the aforementioned YouTube monetization efforts, Google needs to stop hemorrhaging talent if it wants to continue to be as dynamic as it has previously proven itself.