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New USF Study Reveals Why Consumers Continue to Be Deceived by Fake Online Reviews

June 5, 2025
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Dezhi Yin -- University of South Florida
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TAMPA, Fla. (June 5, 2025) – In an age where digital interactions dominate consumer decision-making, the trustworthiness of online reviews has become a critical concern for both researchers and the general public. Despite widespread awareness of fake reviews that manipulate consumer behavior, a groundbreaking study led by University of South Florida researchers reveals a persistent and striking tendency among consumers to trust online reviews—even when it defies established evidence. This phenomenon, rooted deeply in psychological processes, challenges assumptions about skepticism in the digital marketplace.

The study titled “The Illusion of Authenticity in Online Reviews: Truth Bias and the Role of Valence,” recently published in the leading journal Information Systems Research, addresses a pressing question within consumer behavior literature and digital marketing: Are individuals inherently skeptical toward the authenticity of online reviews, or do they exhibit a cognitive bias that compels them to trust information unless challenged by undeniable proof? The investigation uncovers the pervasive influence of what psychologists call the “truth bias,” the innate predisposition to believe communicated information is truthful unless there is strong indication suggesting otherwise.

Associate Professor Dezhi Yin of the University of South Florida’s Muma College of Business, a principal investigator in the project, explains, “Our objective was to deepen the understanding of how consumers discern between genuine and fabricated online reviews. While prior studies have typically focused on fake review detection via technical algorithms, we wanted to center on the consumer perspective—who remains the ultimate target and victim of review manipulations.” The research team also includes co-authors Samuel D. Bond and Han Zhang from Georgia Institute of Technology, with Han Zhang also affiliated with Hong Kong Baptist University, combining expertise in information systems, behavioral science, and marketing.

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Over a five-year period from 2018 to 2023, the researchers conducted a series of five experimental studies involving hundreds of participants. These participants reviewed collections of online consumer reviews—predominantly for restaurants—and were asked to classify each review as either “real” or “fake.” Crucially, participants were informed beforehand that half of the reviews they were about to assess were fabricated, establishing an environment of guarded skepticism. Contrary to expectations, however, participants still overwhelmingly categorized a majority of the reviews as authentic, revealing a pronounced truth bias that blurred their ability to detect deceptions effectively.

One revealing part of the study involved participants viewing twenty restaurant reviews simultaneously, with explicit knowledge that only half represented genuine consumer opinions. The design allowed participants to switch between reviews freely, providing the opportunity to recalibrate their judgments by comparing across the entire dataset. Yet, the average number of reviews classified as authentic exceeded the actual number of genuine reviews, indicating persistent over-trust. This tendency underscores the cognitive difficulty humans face when counteracting inherent biases even when they are primed to be skeptical.

An intriguing facet of the research explored the impact of “valence,” or the positive or negative tone of reviews, on perceptions of authenticity. Real-world analyses indicate that fake reviews tend to skew negative more significantly than positive, as competitors often seek to undermine rivals by posting unfavorable content. Paradoxically, study participants demonstrated a stronger propensity to believe negative reviews over positive ones. This disconnect between actual deceptive behavior and consumer perception highlights a critical vulnerability in the way online reputations are shaped and maintained.

The consequences of this truth bias extend beyond academic interest to practical challenges for online platforms, e-commerce marketplaces, and businesses reliant on consumer feedback. Since users inherently trust most reviews—even when warned about fabricated content—platforms that depend on users reporting fake reviews face an uphill battle. Temporal delays in flagging false content and users’ cognitive biases reduce the overall effectiveness of community-driven policing. Therefore, the authors advocate for proactive and systematic detection mechanisms using advanced algorithms and machine learning models targeted especially at negative reviews, given their outsized influence and susceptibility to fraud.

Furthermore, the study recommends platforms consider thoughtful user interface modifications to help consumers navigate the complex landscape of online reviews more accurately. Design choices such as segregating positive and negative reviews, integrating rating-based sorting, and highlighting suspicious patterns could enhance users’ decision-making faculties and reduce deception’s impact. These strategies offer scalable and user-friendly approaches to complement technological detection, fostering a healthier ecosystem of consumer information exchange.

Beyond immediate practical applications, this research opens avenues for deeper interdisciplinary inquiry intersecting psychology, marketing, information systems, and digital communication. Understanding the interplay between cognitive biases such as truth bias and the contextual factors shaping consumer judgments can inform more robust models of online behavior and misinformation dynamics in the digital economy. Such insights are pivotal for devising effective interventions to combat misinformation and restore trust.

As the digital marketplace continues to evolve, the findings of this study serve as a timely reminder that the battle against misinformation is not solely technical but fundamentally human. Consumer psychology wields considerable influence in how information is received and acted upon, often overriding rational considerations. By addressing these psychological dimensions, researchers and practitioners can develop more nuanced strategies to protect consumers and maintain the integrity of online information.

In conclusion, while increased awareness about fake reviews does prompt some caution, this research illuminates the enduring and potent nature of the truth bias in consumers’ evaluations of online reviews. Platforms and marketers must recognize this psychological tendency to design more effective countermeasures, balancing technological innovation with cognitive insights. Such combined efforts are essential to safeguard the veracity of consumer feedback and support informed, confident decision-making in an era where trust increasingly shapes digital interactions.


Subject of Research: People

Article Title: The Illusion of Authenticity in Online Reviews: Truth Bias and the Role of Valence

News Publication Date: June 5, 2025

Web References: https://pubsonline.informs.org/doi/10.1287/isre.2023.0339

Image Credits: Credit: USF

Keywords: Marketing research, Marketing, Advertising

Tags: authenticity in online reviewscognitive bias in consumer decisionsconsumer behavior psychologydigital marketplace challengesfake online reviewsinfluence of online review valenceonline reputation managementpsychological processes in decision makingskepticism towards online informationtrust in digital marketingtruth bias in consumer trustUniversity of South Florida research
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