If Facebook had a dislike button Facebook would become ten billion times more annoying than it already is

Think about it

Each person would probably have a thing on their timeline where it kept track of the number of likes and dislikes the person has and probably give it a number value where dislikes take away points from the likes

People would probably be like-grubbers

Some people would just dislike everything for the hell of it

It would turn into total insanity