For me, one of the problems with the "Like" button is that it discloses the name of the person who did the liking. That can lead to nonsense thoughts such as, "If I like a lot of Fred's posts, then maybe Fred will start to like mine." OR -- "Fanny liked my post so, to be courteous, I must like one of hers."
Further, "like" implies agreement with what the post is saying. However, I can "like" a post that I do NOT agree with -- because the post displays good logic, or is good at disagreeing-without-being-disagreeable, or has made me stop & think, or was unusually pleasant or jocular, or... whatever. Also, I can intensely DISlike a post that presents ideas or things that I fully agree with, but the comments are expressed in a unnecessarily crude or sarcastic or contentious way.