I'm not trying to be a jerk, I'm being curt. What differentiates dmtri? It looks like just another site to post stuff anonymously. Why would I use it over 4chan or reddit etc etc.
These are things to think about if you want it to take off.
People on Reddit create throwaway account for anything they want to disassociate themselves from (controversial stance on politics, science, religion etc). Dmtri has ability to post anonymously whether you are signed up or not. When you are signed up you can either post revealing your username or post anonymously.
4chan is very situational and temporal. Dmtri is not like that. Content stays on the site.
You probably need to make the site appear more active, until there's enough interesting content to keep visitors there a while and encourage them to post.
Ya, you are right. There's no silver bullet to user acquisition i think. I do spend time writing on the site hoping to have some readers.
You could easily change the tone here. "I joined a bunch of very specific types of groups so I could manually write a post that tells them about a free app that I built for their demographic."
I felt the "scum" right away, but then I thought about the source of the feeling. Scummy is when you write bait. Telling people about your app - sometimes that requires a door to door cold call.
I think this app deserved to be shared with that group, and it's particularly un-scummy considering the fact that it's brand new, free, and isn't trying to mine for email addys.
However, I detest the thought of spamming every facebook groups and such. I tried organically growing by writing really good content (http://dmtri.com/posts/28/alexis_ohanian_-_%22i_don%27t_regr...), but that in itself is a problem because I have to get visitors for that.
I worked hard on the project but I feel a bit discouraged by lack of interest so far.