This is a well studied field. For instance, relevant scientific literature: "How social influence can undermine the wisdom of crowd effect" http://www.pnas.org

This is a well studied field. For instance, relevant scientific literature: "How social influence can undermine the wisdom of crowd effect" http://www.pnas.org/content/early/2011/05/10/1008636108 http://www.pnas.org/content/early/2011/05/10/1008636108