I just found out that we can unlike posts after liking them. There are a few things I want to ask. 1) Is being able to unlike posts a good idea? 2) Should there be some sort of penalty if someone keeps liking and unliking posts? 3) This last one is just a curiosity. I wonder if unliking a person's post decreases his/her number of likes or if it does nothing. Maybe someone could like and then unlike this post to see what happens.