Facebook has once again changed, and this time I'm not sure it's for the better; in what seems to be the worst Christmas present ever Facebook now enables you to reply to a specific comment on a photo/post. As you can see in the picture above Comment #2 (the one that starts with "Obviously you have") has one "threaded comment" to it (the "nice one :P :P"). To which I can further reply directly to that comment. or post a comment to the whole original post.
This is going to get very messy very soon.. get rid of it Facebook, NOW!