Bloggers love to make up names for stuff and here is a relatively new acronym- SMO. Social Media Optimizing basically means that you are actively feeding and rewarding your visitors who share and link to your content across different web platforms- blogs, forums, social communities, news sites, etc.
Here is a great blog post that lists some rules for SMO and how it can benefit your site and SEO (search engine optimization) efforts.
http://rohitbhargava.typepad.com/weblog/2006/08/5_rules_of_soci.html
Also check out the additional rules linked below and lots of other great links below that.
