On newsgroups and forums with similar mechanics, users that want to refer to an earlier comment will quote some of the text and the newsreader will add some marks to the left or indent it or something. After several postings, you end up with long blocks of quoted text at several levels deep.
Chris: Yes, I really hate when people leave in huge blocks of irrelevant text from earlier posts.
Weblogs tend to only allow comments at a single level. What if, when reading a posting on a weblog, one could select a paragraph, and then click a Respond button, which would associate the comment with that particular paragraph. Or, better, a fancy inline editor, where one could add text in-between paragraphs. To another reader, the whole text appears as it was originally, but upon selecting a Comments button, the additions are displayed in place.
Julie: We need weblog tools that have much more sophisticated comment systems. Unfortunately, right now I'm battling all kinds of comments from "enhancement pills" web sites on my weblog where I write about how to get cheap loans.
Chris: Perhaps you need to disable posting links from comments.
It might appear something like what happens when you click the Comments button here: