I really like Jcomments and would love to use them as a Facebook type wall. I have somewhat achieved this at my current site... see
http://www.oilfieldsalesman.com - I reversed the listing of the comments where the newest shows up first. I also changed some of the language "Update Status" etc. I have the comments integrated with my Kunena forum so users can have a Avatar that links back to their profile. The only thing that is really missing is the ability to have multiple comments on an existing comment.
You can comment on a comment now, but it quotes the existing comment and takes up too much space. I know I'm asking a ton but its merely a suggestion. Like on Facebook a comment can have 20 hidden sub comments that are shown with a symbol... example "2 comments". I think the possibility of building a very functional "Facebook Type" wall with Jcomments is easily within reach as I have almost done so already at the aforementioned website!
Just a wish of mine! Thanks