I wonder how effective it might be, in addition, for major sites to point directly to user generated content on their sites, posted by both well knowns and unkn

I wonder how effective it might be, in addition, for major sites to point directly to user generated content on their sites, posted by both well knowns and unknowns, and assert that that specific content would cause trouble for both the poster and the site. Bonus points if someone points to all infringing content on members of Congress sites, a la the recent Congressional torrent torrent.