They found that the single positive vote often created a snowball effect, leading to increased visibility and an overall greater amount of up votes -- 25 percent on average, to be exact. Meanwhile, comments given a bad start also had an amplified response -- both negative and positive. These "corrective" up votes kept such comments from being totally buried.
MORE: http://www.nbcnews.com/technology/likes-breed-likes-study-finds-herding-behavior-among-commenters-6C10879211
