SMO- Social media optimization functions with the purpose of driving traffic to your website using various social networking websites like Digg, Facebook, Twitter and Youtube among others. SMO consists of creating and managing profiles on social media sites and networks in order to create awareness of a brand or service.
SMM- Social media marketing is similar to SMO, but goes deeper in the level of social interactions by blogging, taking part in online forums or chat rooms, and through paid social advertising and search.