Ask HN: Solid Search Engine traffic but virtually no referrals

I created a side project over a year ago (http://www.1dollarthings.com) I have solid traffic coming from search engines which makes me think it's a highly useful tool, but no one is interested in writing about it or linking to it from their site. There is also virtually no social sharing. Any advice on how to create social buzz or convince bloggers that their audience already finds this tool useful? Any stories of how you got the word out on your side project without much time or money?