Replying to +1 or like buttons.

first off, dont hate on me if this is a repost of an idea, im rarely in site discussion.

i had the idea, that similarly to facebook or youtube, comments could be rated up or down or given a thumbs up. that would stop threads getting so long simply from posting "this" under a post.

maybe for gear talk, top rated comments could be moved to the top, so the most helpful answeres will be seen first, without having to go through hundreds of posts. likewise stupid or hate comments could be rated down and move to the bottom of the thread.

whats ur opinion on this?