I don&#x27;t think comments would be useful. To make a proper comment on a paper requires a significant amount of work (as does refereeing). Lowering the barrier to entry would produce some first impressions, the usual moans about lack of citation and misunderstandings. If a paper deserves a serious comment, I think the proper format for that is another paper.<p>Although citations are horrible metrics, I think some sort of reputation ratings based on quick likes would be even worse and even easier to game.