Blog Share Monday is extremely useful, you'll probably get anywhere from 10-25 shares of your content. In addition, make sure you are part of the Rockstar blog list. Whenever you post, it picks this up and you become part of a feed. This typically brings in 8-15 people when I publish new content.
Being very active on Twitter is a great way to promote your blog. You don't need to post about your site all the time. Make sure you publish other people's content, talk to them about it, comment on it. As you grow your following, they will tweet your content. If you have a very compelling piece of content, don't be shy, ask your Twitter followers to retweet it.
The same is true of Facebook, although you shouldn't really repost that much b/c you'll lose followers, and if you blog anonymously, it's a great way to be outed. I'm personally planning on running a few Facebook ad campaigns to increase my page likes. I figure once I hit 100 likes, I'll look more legit and have a solid following that will grow.