Social Influence Bias

Social influence bias is an asymmetric herding effect documented on online social media and review platforms, in which users overcompensate for negative ratings they see from others while further amplifying positive ones, a pattern researchers trace to people's underlying desire for group acceptance, which leads them to adjust their own behavior to match group norms. The bias sits alongside several related cognitive biases, including the bandwagon effect, authority bias, groupthink and social comparison bias, and raises an open question about whether being influenced this way reveals a person's authentic preferences or instead produces an inauthentic version of their actual views. The researchers Lev Muchnik, Sinan Aral and Sean J. Taylor published landmark work in 2014 showing that early positive social influence tends to create lasting ratings bubbles, while early negative influence tends to be corrected by the crowd over time, a finding later reinforced by research from Cicognani and colleagues. Because online reviews across marketplaces, restaurants, accommodations and film sites function as widely trusted sources of information, the herding pattern they document means later reviewers are often influenced by the opinions posted before them rather than forming a fully independent judgment of their own.