What is SEO, SEM and SMO?

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What is SMO?
So now we know what SEO and SEM are, but what is SMO? SMO stands for Social Media Optimization. Perhaps the best definition I found for this was via a forum on the discussion of SMO:

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. — anonymous