What you don't know about managing URLs can hurt your website's Search Engine Optimization (SEO). Marty and Bill Ross Share URL management tips to help SEO.
Bill inspired me to share what I learned about URL management when I spent a week with SEO Guru Bruce Clay a few years ago. After Panda making sure your URLs aren't messy is critical. The article touches on social media marketing too because inter-linking there can hurt as well.
The article is on Atlantic BT's blog: http://www.atlanticbt.com/blog/seo-tip-of-the-week-being-careful-with-your-urls/
and includes a link to Bill's Linchpin SEO article: http://www.linchpinseo.com/ranking-user-metric-fragmentation