This is an interesting article from xbiz

The newly released 2257 revisions may make tube sites legally liable if the content they promote is being distributed for commercial gain.

“If it's user-generated material in which the site doesn’t control the content, the site nevertheless is a distributor,” noted adult industry attorney Gregory Piccionelli told XBIZ.
Read more at http://www.xbiz.com/news/all/103029