There are two main ways to use Facebook to promote your blog. You can create a business page for your blog and you can also join groups that relate to your blog topic. I recommend doing both but using them in different ways.
Facebook Page:
Rather than just adding links to your blog post on your Facebook page, I recommend adding rich content like photos or videos with text copy to a minimum of 140 characters, this will also allow you to share the same post for Twitter.
Facebook Groups:
Join Facebook groups that are relevant to your website topic, be sure to read the group rules before posting. My suggestion is to interact with the groups first, like and comment on other peoples post first to get a feel of the community. Then if the groups you joined allow you to promote your content than do so. However, you will usually get more traffic if you are replying to a question and can refer them to one of your blog post that may answer their question.
