I recently discovered if you click on the number of likes a post has you can see who has posted. I think this feature should be removed in the interest of getting neutral / anonymous feedback.
For example, the feature may discourage a person from liking a post if there is a general trend against the poster (i.e. they are receiving none or few likes and the counter-posters are receiving more). It may also engender group-liking where people will like something after seeing who else has liked it. (This kind of thing is already a potential problem based on number of likes or popularity of poster, but knowing who has liked may cause additional bias.)