There have been a couple of occasions in the last few months when I have felt that comments on this blog were in danger of crossing a legal line. In one case, I gave an explicit warning in response to a comment.
I have a strong free speech policy on this blog. I will never reject a comment just because I disagree with it. But I am also conscious that this blog is a publication and is bound by the laws in the same way as any other publication.
Legal Eagle had a very good post in this area that also brought out another issue, comments on bulletin boards etc.