30 Tips for Using Social Media in Your Business

Some more social media tips:
http://www.inc.com/articles/2010/01/30-tips-for-using-social-media.html

7. Interact with visitors—really. Just putting up a blog or a Facebook fan page won't do much good if visitors sense the flow of conversation only goes one way. In fact, Matt Mullenweg, founder of blogging platform Wordpress, lists not participating in comments as a surefire way to kill a community. Mullenweg and his team field the many suggestions users have for Wordpress through his blog.

There are some other good tips in there also...