Yes, where is the line? Is TechCrunch a "news organization?" It's got a staff and lots of traffic, but isn't it just a really successful blog? Is Joel on Software or 37 Signals a blog or a very elaborate ad? How about Seth Godin or Guy Kawasaki's which are really just ads for their own stuff. They get their own stuff for free. Do they have to disclose that?
The lack of a significant distinction becomes even more obvious when you consider a group of people sharing a blog vs. a media organization.