AdAge just published a great Q&A article for marketers who might be afraid they've missed (or are about to miss) the social media marketing train. It answers a few basic questions about core social media elements like blogging and also provides a handy case study and industry stats. It's worth a read, especially if you've always wondered what SMO stands for (don't worry, you're not alone).
http://adage.com/digital/article?article_id=125708