That's an interesting idea. Could this be done in a way that's not too elaborate for users to actually use? UI wise do you recon it should be line based? paragraph based? sentences based? arbitrary character range based? color coded? Also note the not so recent trend of not having publicly visible dislike statistics (YouTube) and in many cases even not having the dislike buttons themselves (this forum and many other places). I remember we used to have dislike buttons on many social networks but then they were removed, perhaps there was a good reason for that. In addition to that there's a tendency: posts having visible like (dislike) markers getting more likes (dislikes) over time, over-amplified compared to the case when those markers are not publicly visible.