This presentation was given at the Social Media Plus Conference in Philadelphia on May 25th, 2010. The presentation reviews core concepts for cloud to provoke thought in business, marketing, and sales professionals that are learning about building social media apps. It includes: * a review of cloud technology * A deeper dive on the big 4, Google Amazon Facebook and Twitter * Some showcases * Field Notes on some suggestions what do build software in, what not to do, what not to deploy, etc.