Greg Isenberg (@gregisenberg) has spent years practicing the art and and studying the science behind building hit viral products. Today he's using his skills to build a communities design firm called Late Checkout, based on his theory that the best products come from unbundling parts of much larger communities and social networks. In this episode, Greg and I discuss the work that goes into building viral products, how to use niches to gain an advantage as an indie hacker, and why the massive growth of large platforms like Twitter and Reddit has created a short window of time for great business ideas.