First Nesting comments format like here in boonex with 2 colour system,
1. Comments with one colour( light green etc)
2. All replies to the comment with one colour ( light blue etc)
Show only top rated 3 comments and hide rest of them along with the replies to the comments.
Allow photo posting option both for comments and replies.
Allow @ and # function in comments and replies.
Comments should only refresh when you move up or down so new or new top rated can refresh.