I'd like to make a suggestion about the use of Replies and Comments.

I don't understand why we currently have a "Comment this post" button on the main post. Surely any replies to the main post should be set out as Replies underneath, and the "Comment this post" button should only show on Replies.

I would suggest this button is removed from the main posts and replaced with the green "Add a Reply" button that is currently at the top of the page underneath the toolbar. Right now, if you read a long post and wish to reply to it, you either have to scroll all the way down to the bottom of the page after any other replies, of which there could be many, or you must scroll back to the top of the page to find the green Reply button.