I targeted bloggers because bloggers are keen to get more traffic and will therefore submit their own content. Here's a 5 point plan you might try:
1. Find a blogger in your niche and post one of his articles to your site
2. Post a comment on the post page asking a question about the article
3. Post a comment on the original article to let him know you like it and have submitted it to X bookmarking site
4. When he visits your site, he will see the question you posted and feel compelled to register so he can answer it!
5. Drive as much traffic as you can to the post page using Twitter, Facebook, etc. so people click through to his site with you as the referrer. If he checks his logs and sees traffic from your site, he'll want to keep using it.
Repeat everyday for about four months (as was my case) and then the site should grow by itself.
Also, in my FAQ, I have this:
Can I submit my own posts?
Unlike many social bookmarking services, JapanSoc encourages bloggers to submit their own articles to share with other users. However, please note this clause from the Terms of Service:
In connection with your Contents, you agree that you will not:
…
(g.) abuse the privilege to submit links to your own content, e.g. multiple, back-to-back submissions from your blog, submitting the same content from multiple sources, or re-submitting the same story multiple times;
Sensible usage: For every article you submit from your own blog, submit one from another site, too.
That's important, otherwise you'll just get the same few bloggers posting nothing but their own articles all the time, and your site will become boring very quickly.
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