So I have been struggling with this problem for a bit now. The root of the problem is how does one properly notify people of when they receive comments on their content, when comments are tiered(meaning they form a tree of comments). For the purposes of this discussion, let's say our comments look something like this:
- comment(1) by danz
|- comment(2) by jayd3e
|- comment(4) by timtim
|- comment(5) by jayd3e
|- comment(6) by bburd