I like the idea although I can't help but think the visualization sort of draws me to comments with lots of responses....and on HN that is ok. On sites that heavily rely / encourage getting responses such as Twitter I worry it just encourages posts that are trite, obnoxious and such as those get the most responses. Granted this is a visualization tool so it's not "responsible" for issues that are largely human / plat…
I like that mini-summaries on the left-hand side ("subconversations about XX"), but the graph view seems to prioritise responses with the maximum amount of comments.
E.g. if there is a flame-war going on in one of the subthreads, it will be more visible than a highly rated comment with a few interesting subcomments.