It would be useful to be able to 'star' or 'favourite' a comment or submission, to have them accessible in a private list, and to see how many people had done this to your own comments/submissions.
I wouldn't like this to be generally visible though. As others have said, it creates a halo effect and discourages diversity of opinions.
I wouldn't like this to be generally visible though. As others have said, it creates a halo effect and discourages diversity of opinions.