Earlier this month, The Motley Fool Twitter account (@themotleyfool) asked, “What investment principles and ideas have you learned from David Gardner?” The thoughtful responses, in addition to being a kind birthday gift for David, did a great job of summarizing some of the most salient tenets of the Rule Breaker philosophy. And they happened to be perfectly organized and arranged to share with you here. Sponsor Link: Real people, Real brands, Real connection. Go to sproutsocial.com to learn more.