I don't think it's a good idea, many people post things only to vent or express themselves, disliking what someone post seems like not respecting that person... And o.k. if one dislikes the post instead of it could write a comment and the author of the post has the freedom to reply or not.
Besides not everyone is liked by everyone, and surely some just for that reason will dislike your posts. Seems shallow... perhaps some sensitive people will feel attacked.