I'm not going to get into the motivation/need for the site at all, but here's a brief review of concrete usability issues with the site.

Why does it require signing up for a profile? Isn't this about anonymous sharing?

Are all the faces supposed to be happy? That's all I see. Or do they reflect the mood of the post? Why aren't any angry/sad faces on the front page?

Why are the big "1 - 2 - 3 - 4 - 5" numbers needed on the far left of every story?

"Make an account by clicking here" has horrible link usability. Links should be colored (preferably blue) and underlined. Plus "click here" should never be the anchor text. Same with the "Click to Login" link.

The padding around your header menu items is not clickable. Give them the "hand" mouse cursor too. The underline-on-highlight there is not needed.

Putting random jibberish into the "post a new thread" feature then clicking submit does not appear to do anything. Just clears the fields. Is that malfunctioning validation, or does the feature not work?

You need to "fake it til you make it". Why should I contribute to this site if the front page is entirely links that are 3+ weeks old and have 0 comments?