This Plugin will transform WordPress into a custom knowledge Base application to power your documentation needs. You'll be able to add articles and frequently asked questions, rate content, show related articles, and much more!
Wikis, blogs and podcasts: a new generation of Web-based tools for virtual collaborative clinical practice and education BMC Medical Education 2006, 6:41
PostRank claims to measure social engagement, including blog posts responding to someone else, bookmarking an article, leaving a comment on a blog, or clicking a link to read a news item.
Let's put this to bed once and for all, folks: There's no such thing as a "duplicate content penalty." At least, not in the way most people mean when they say that.