Reverse Requirement: Social Bookmark Plugin for a WordPress

There are many social bookmark icon creating plugins for wordpress.

But there is there a plugin which would create a ‘Social Bookmark on your own wordpress blog’ feature. that is readers can submit links on your own wordpress blog, vote for other such links and comment and discuss…

the submitters do not have to be wordpress authors to be able to submit, perhaps if login is required it is stored in separate tables than the wordpress author table…

has anyone seen something like this or knows of a plugin that can allow a wordpress blogger to include this feature… the objective is to have two things in parallel on the same blog: blog itself and in parallel have an active reader participation on what stories they find interesting and have an active discussion on it.