There is a problem with the like and dislike buttons. Depending on what source you are using it is easy to vote more than once on the like or dislike.
I noticed this initially on my tablet touchscreen. If I tap quickly & continuously click on the like/dislike button, it will register as multiple votes, the same happens on my laptop when I do the same thing with my mouse but this method doesn't register as many votes.
It is only a matter of time for others to pick up on this and there may be some who are already aware of this. It basically means that the likes and dislikes will eventually be meaningless.