1) Space for algorithmic innovation? (which is the coolest thing to be in front of but I guess there must be already some algorithm application to handle this case) 2) Why? Could you give some examples? I ask because I also think that rating-less like is dependent on the subjects personality. For me a dislike button should be much more meaningful because as a optimistic there is a bigger range of things I like with a bigger variation of likeness, while when I (would) hit dislike I must be pretty sure that I don't like it. 3) I agree but the implication is that sites should use negative qualifications differently, it shouldn't be shared with others in the same way the likeness is shared unless, as in your suggestions, they enable you to find better content. I don't go telling people I dislike that I dislike them, I just avoid them. The approach should be similar.