Bloggers in your target market are priceless. When I launched http://www.scribophile.com/ http://www.scribophile.com/, a site for writers, I made a list of 50

Bloggers in your target market are priceless. When I launched http://www.scribophile.com/ http://www.scribophile.com/, a site for writers, I made a list of 50 writing blogs. They didn't have to be big names; writers love to write so there's lots of writers' blogs out there. I sent them a friendly and business-speak-free invitation to try the site with a free premium upgrade. Not everyone took me up on it, but a subset of those who did ended up participating and blogging about the site. A few years later and I still get traffic from some of those blog posts. I also still continue reaching out to bloggers, but now offering a month's ad slot if they're interested in writing about us. Now that the site has significant traffic, it's a great incentive for them. Make sure to reach out to people with a carrot of some sort--give them an extra reason to want to write about you. You'll never get a 100% success rate, but even a 10% success rate will be worth it.