Social media optimization increases the visibility of your social media profiles, your social networking activity and your published content so that it is found by people searching for information and resources that relate to your content. Social media optimization helps drive traffic to your website or blog, makes it easier for others to share with their circle of influence, builds community around your brand and helps search engines index your social media profiles, social activity and blog posts more easily.
Similar to SEM, SMM stands for Social Media Marketing. And as you can guess it involves paid advertising through social media networks. If you are familiar with Facebook ads, then you are seeing SMM in action. It is the process of using paid advertising to broaden your customer reach and increase your brand exposure.