An engaged, passionate community around an ecommerce business can drive referrals, loyalty, and repeat sales. But developing and growing that community is not always easy. For this episode in my series on building an ecommerce business from the ground up, I spoke with Andrew Youderian. He's the founder of eCommerceFuel, a popular, private community of ecommerce merchants who communicate via an online forum and, also, at meetups and at an annual conference.