Socialmedian, the social news site created by Jobster co-founder Jason Goldberg, is opening the doors on its public test tonight.

The site has a compelling concept — that the best way to sort through the tremendous flood of news is with a little help from your friends — and it has been in private testing mode for four months. Socialmedian is built around news networks with topics like “tech news” and “venture capital,” which pull stories from relevant sources around the web. Users can submit articles to a network, create their own networks and also “clip” (recommend) the articles they find on socialmedian.

The New York- and Pune, India-based startup faces some big challenges; there’s a lot of competition, and not just from news-focused sites. After all, many news aggregators allow you to share news with your friends, and most social networks allow you to post interesting articles, too. With its “clip” feature, socialmedian can also sound a bit like a Digg clone. And when I looked at socialmedian back in May, nothing really grabbed me. Yes, there were some c