Facebook thinking about `dislike` functio

I personally would have a Dislike button that is only visible to the user, and visible not publicly, but which would affect the likelihood of similar entities appearing on the wall and influence what friends see. Having a Dislike button that would subtract from the Likes or shown publicly as a separate metric will be open to abuse, bullying, and manipulation (negative social proof, whatever social proof means).? BBC News - Facebook thinking about `dislike` function - Zuckerberg