It would be awesome to have reactions for comments. When I scroll the comments after watching a movie or episode I do not want to reply with more than five words. Reactions would be a good solution for this 
You can “Like” comments. Is that the kind of reaction you are looking for? Or are you looking for a larger lists of emojis that you can react with?
I do look for a list of emojis. A like is very one-dimensional. Also, a like votes the comment up. I just want to react to a comment regardless of up-voting and with some more possibilities.