The wiring of our minds and the knowledge of how to make certain chemicals fire in the human's brain, are dangerous knowledge held in the hands of people with no moral compass or understanding of what they are doing. Just push the button, the subject smiles, move on to the next one... no thought for the human toll of what all that button-pushing is doing.
Maybe some day in the future the like button will be outlawed because of its unfair triggering of our uncontrollable brain chemistry. You'll have to type out three sentences about WHY you like this post, and provide evidence.
Carpal tunnel will skyrocket.