The "opinion matching effect" (OME): A subtle but powerful new form of influence that is apparently being used on the internet [PLOS ONE, in press]

66 Pages Posted: 9 Aug 2023

See all articles by Robert Epstein

Robert Epstein

American Institute for Behavioral Research and Technology (AIBRT)

Yunyi Huang

American Institute for Behavioral Research and Technology

Miles Megerdoomian

American Institute for Behavioral Research and Technology

Vanessa R. Zankich

American Institute for Behavioral Research and Technology

Date Written: August 4, 2023

Abstract

In recent years, powerful new forms of influence have been discovered that the internet has made possible. In the present paper, we introduce another new form of influence which we call the “opinion matching effect” (OME). Many websites now promise to help people form opinions about products, political candidates, and political parties by first administering a short quiz and then informing people how closely their answers match product characteristics or the views of a candidate or party. But what if the matching algorithm is biased? We first present data from real opinion matching websites, showing that responding at random to their online quizzes can produce significantly higher proportions of recommendations for one political party or ideology than one would expect by chance. We then describe a randomized, controlled, counterbalanced, double-blind experiment that measured the possible impact of this type of matching on the voting preferences of real, undecided voters. With data obtained from a politically diverse sample of 773 eligible US voters, we observed substantial shifts in voting preferences toward our quiz’s favored candidate – between 51% and 95% of the number of people who had supported that candidate before we administered and scored the quiz. These shifts occurred without any participants showing any awareness of having been manipulated. In summary, in the present study we show not only that OME is a large effect; we also show that biased online questionnaires exist that might be shifting people’s opinions without their knowledge.

Keywords: opinion matching effect, OME, online manipulation, recommender systems, online quizzes, voting advice applications, election manipulation

Suggested Citation

Epstein, Robert and Huang, Yunyi and Megerdoomian, Miles and Zankich, Vanessa R., The "opinion matching effect" (OME): A subtle but powerful new form of influence that is apparently being used on the internet [PLOS ONE, in press] (August 4, 2023). Available at SSRN: https://ssrn.com/abstract=4532141 or http://dx.doi.org/10.2139/ssrn.4532141

Robert Epstein (Contact Author)

American Institute for Behavioral Research and Technology (AIBRT) ( email )

United States

Yunyi Huang

American Institute for Behavioral Research and Technology ( email )

United States

Miles Megerdoomian

American Institute for Behavioral Research and Technology ( email )

United States

Vanessa R. Zankich

American Institute for Behavioral Research and Technology ( email )

United States

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