I post it here. HN is a fun place and I love the kind of discussions that come out of it. I get excited when I'm about to post something.
For stuff related to my main website, it's basically social media (reddit, twitter, linkedin) + a few business partners + a few friends. I'll do a bit of link building where appropriate.
Social media in particular has picked up dramatically in the past year as I started posting more about my work (see @aboutberlin on twitter). I have underestimated the value of an audience. I get ten thousand eyeballs on anything I publish. I also got a network of helpful people and industry insider out of it. I can definitely vouch for working in public.
The secret is simple: be a pleasant participant, not a self-interested promoter.