I have a website which share links. Once your post article with your website link, it will be displayed in the home page of my website.

After posted the following are possible.

Visitor can rate
Visitor can comment
A thumbnail of the website is taken and displayed.
If the submitter has any follower, they will get the feed.

Highest rated article will be in the top of best articles.

This is what i have done. Also, there is no no-follow attribute. So it will give quick backlinks to users of my website.

The million dollar question is how to make it popular :-)