I spoke to a media solicitor a couple of years ago about this. According to them, fair dealing is there to enable discussion and debate of images or other content in educational institutions, where the discussion will be controlled and targeted. He did not seem to think that general commentary on forums for example would necessarily be covered in this, where the debate might be public, inappropriate, or even potentially damaging or irksome to the originator. I presume this is why the general protocol on forums is that a link is posted to the work rather than the content itself, and that the discussion is tempered to a degree.
I have had countless cases where entire articles, including images and wording, has been lifted from my Blogs and republished in their entirety on other photography blogs or chat rooms. I am always given attribution, but nevertheless I think the purpose of republishing my work is to draw more traffic and prominence to those places - and that may at times be at the expense of traffic going to the original article on my own website (particularly once the commentary gets going). On some occasions the blog owners do ask my consent but as an author I strongly feel that my permission should be gained from the outset and there needs to be a clear rationale behind the request. I'm not sure the mantle of fair dealing is as broad as some people seem to think.
