Need advice on building a community / networking
I have been working on a submission-based networking site for quite some time now.
The problem is... I don't really know how to get people to start "networking" on it, so I need a little advice.

Most visitors just come from another site and look at one or two submissions, and then leave. How can I get them to stay

and browse?
More importantly, how can I get them to sign up, submit their own content and comment on other submissions?