Collaborative paper filtering?

At ISIT 2012, there were posters up for a site called ShareRI.org: Share Research Ideas, an initiative of a student at UIUC named Quan Geng. It’s a platform for posting and discussing papers — sort of like creating a mini-forum around ArXiV posts. It seems to be just starting out now, but I figured I would post the link to see if others take it up. I imagine as things scale up it might run into similar problems as Wikipedia with trolling etc, but it’s an interesting idea which has come up before in discussions with the IT Society Online Committee, for example.