For anyone out there is interested in keeping up with Facebook news and trends, I'd recommend the following blogs:
All Facebook - http://www.allfacebook.com
Inside Facebook - http://www.insidefacebook.com
Maybe you'll be able to learn something that you can apply to your marketing efforts. In the very least, it's important to understand how social networking is changing the way people keep up with each other and interact, and (obviously) Facebook is a huge player right now.
Mashable is my all time favorite website for keeping up with social networking/web 2.0 news. What are everyone else's favorite resources for these topics?