Add a highlight so we can see when we liked, disagreed with, or found a comment insightful.
Sometimes, I don't remember if I liked, disagreed with, or found a comment insighful. The only way I find out if i did this previously is either by hovering over the appropriate tag or by clicking the appropriate tag and watching if the count went up or down.
So, I suggest adding a highlight to the like, disagree, or insightful tags on a comment if you clicked on it already. Maybe make it bold, or change the color of it. That way it's easier to know which comments I already liked, etc.