Does not it make it kinda even more difficult to operate discussion forum, or IRC channel, or, I dare say, anonymous imageboard like 4chan? By what logic operator may be held liable for user's postings? If unidentified person offended other person in, say, supermarket - would supermarket owner be held liable? Operator may be forced to delete offending content by court order, or at least as with DCMA complaints - by the letter from offended person, that's understandable. But to hold operator liable for user's postings - means say farewell to any forms of discussions on the internet, except where user posted content is premoderated or user have to somehow authorise with his real identity.