So you can either buy your audience or earn your audience.
If you want to earn your audience, you're doing the right thing. Additionally, consider guest blogging on other blogs in your space.
For buying your audience, I have found Facebook ads targeted at your page can be very effective. I've paid ~$.60/US per fan, who then come to your site when you post new things, etc. I bet you could get the CPF (cost per fan) lower if you played with the optimization for a while. (I targeted the ads at people who liked sites and interests similiar to mine.)
If you want to earn your audience, you're doing the right thing. Additionally, consider guest blogging on other blogs in your space.
For buying your audience, I have found Facebook ads targeted at your page can be very effective. I've paid ~$.60/US per fan, who then come to your site when you post new things, etc. I bet you could get the CPF (cost per fan) lower if you played with the optimization for a while. (I targeted the ads at people who liked sites and interests similiar to mine.)