My experience has be not hardly worth the effort. I post to my wall, as well as, on the news feed yet folks tend to bypass my stuff to like a funny picture or just make comments on everything else.
My facebook account is mainly used for my family and friends (who are not my target market). So, I don't really use facebook for my internet marketing. I don't have a facebook fanpage either. I am using other tools that I like better.
For me Facebook is the best choice really. Especially when you're starting your blog from scratch. Make a page promote it update it on daily basis connect it to your site, post links from your blog to FB and see the success.You can get a great referral traffic from Facebook. 500 in my case when i started