Use of Persuasive Language in Communication of Risk during Prostate Cancer Treatment Consultations.

BACKGROUND: Physician treatment preference may influence how risks are communicated in prostate cancer consultations. We identified persuasive language used when describing cancer prognosis, life expectancy, and side effects in relation to a physician's recommendation for aggressive (surgery/radiation) or nonaggressive (active surveillance/watchful waiting) treatment. METHODS: A qualitative analysis was performed on transcribed treatment consultations of 40 men with low- and intermediate-risk prostate cancer across 10 multidisciplinary providers. Quotes pertaining to cancer prognosis, life expectancy, and side effects were randomized. Coders predicted physician treatment recommendations from isolated blinded quotes. Testing characteristics of consensus predictions against the physician's treatment recommendation were reported. Coders then identified persuasive strategies favoring aggressive/nonaggressive treatment for each quote. Frequencies of persuasive strategies favoring aggressive/nonaggressive treatment were reported. Logistic regression quantified associations between persuasive strategies and physician treatment recommendations. RESULTS: A total of 496 quotes about cancer prognosis (n = 127), life expectancy (n = 51), and side effects (n = 318) were identified. The accuracy of predicting treatment recommendation based on individual quotes containing persuasive language (n = 256/496, 52%) was 91%. When favoring aggressive treatment, persuasive language downplayed side effect risks and amplified cancer risk (recurrence, progression, or mortality). Significant predictors (P < 0.05) of aggressive treatment recommendation included favorable side effect interpretation, downplaying side effects, and long time horizon for cancer risk due to longevity. When favoring nonaggressive treatment, persuasive language amplified side effect risks and downplayed cancer risk. Significant predictors of nonaggressive treatment recommendation included unfavorable side effect interpretation, favorable interpretation of cancer risk, and short time horizon for cancer risk due to longevity. CONCLUSIONS: Physicians use persuasive language favoring their preferred treatment, regardless of whether their recommendation is appropriate. IMPLICATIONS: Clinicians should quantify risk so patients can judge potential harm without solely relying on persuasive language. HIGHLIGHTS: Physicians use persuasive language favoring their treatment recommendation when communicating risks of prostate cancer treatment, which may influence a patient's treatment choice.Coders predicted physician treatment recommendations based on isolated, randomized quotes about cancer prognosis, life expectancy, and side effects with 91% accuracy.Qualitative analysis revealed that when favoring nonaggressive treatment, physicians used persuasive language that amplified side effect risks and downplayed cancer risk. When favoring aggressive treatment, physicians did the opposite.Providers should be cognizant of using persuasive strategies and aim to provide quantified assessments of risk that are jointly interpreted with the patient so that patients can make evidence-based conclusions regarding risks without solely relying on persuasive language.

Effects of Character Accent on Perceived Similarity, Transportation, and Narrative Persuasion.

Guided by narrative transportation theory and the social identity approach, this study examined the effects of character accent on perceived similarity, transportation, and narrative persuasion. Cigarette smokers from Kentucky (N = 492) listened to a first-person narrative about smoking-induced lung cancer. The character spoke either with a Southern American English (SAE; ingroup) or a General American English (GAE; outgroup) accent. Opposite to predictions, the GAE-accented character was perceived as more similar overall, engendered greater transportation, elevated lung cancer risk perceptions, and promoted higher intentions to quit smoking than the SAE-accented character. Consistent with predictions, the effects of character accent on risk perceptions and intentions to quit were mediated by perceived similarity and transportation. Taken together, these findings indicate that narrative character accent is a potent cue to similarity judgments, but that actual linguistic similarity is not isomorphic with perceived overall similarity. Theoretical and practical implications for narrative persuasion are discussed.

Latin America and the Caribbean Code Against Cancer 1st edition: Formative research on the comprehension and persuasiveness of the recommendations by the general population.

BACKGROUND: Cancer prevention is the most efficient and cost-effective strategy in cancer control. One prevention strategy is giving credible, clear, and evidence-based recommendations to the individual; however, it is key that these messages are accepted and understood properly by the public. This study aimed to pilot the draft recommendations developed as part of the Latin America and the Caribbean (LAC) Code Against Cancer 1st edition, in terms of comprehension and persuasion of each message. METHODS: A mixed method two-wave study, in which two versions of the messages were presented to the general population in five LAC countries. We used an ad-hoc questionnaire and interviews that followed the cognitive-pretesting methodology. RESULTS: Findings suggest that the messages were generally well understood, especially in Spanish speaking countries, and that the messages were generally more understandable than persuasive. We adapted and revised the recommendations based on the findings of the first Wave and held a second iteration in the Spanish speaking countries. We observed a better understanding of most messages in Wave 2. CONCLUSION: The LAC Code Against Cancer is a valuable tool of well understood messages for the public, with concrete actions everyone can take to prevent cancer. Further research should assess particularities of the region for further efficient dissemination of these important health messages, identify key messages for certain population groups and future interventions that strengthen health literacy in rural and less educated populations to increase behavior change.

Intervention studies to encourage HPV vaccination using narrative: A scoping review.

OBJECTIVE: This review aimed to provide an overview of intervention studies that aimed to encourage HPV vaccination using narratives. METHODS: We searched MEDLINE, CINAHL, PsycINFO, and PsycARTICLES for English language articles that quantitatively examined the persuasive effect of narratives on encouraging HPV vaccination through interventions. RESULTS: A total of 25 studies were identified. Most studies were conducted in the United States of America, adopted a convenient sampling of university students, measured vaccination intention as the primary outcome, and used text messages in the interventions. A minority of the studies measured vaccination behavior and examined the long-term effects of persuasion. Narratives were as effective as didactics and statistics in encouraging HPV vaccination in most included studies. The findings were mixed or scarce for the effect of combining narratives and statistics, and the person (the first vs. third), narrator, framing, and content of narratives. CONCLUSION: More findings from a broader range of well-designed studies are needed to determine which narratives can encourage HPV vaccination across different populations. PRACTICE IMPLICATIONS: Findings indicated using narratives can be a part of repertoire of messages encouraging HPV vaccination.

Public Health Messaging to Address Indoor Tanning: A Scoping Review.

Indoor tanning (IT) is an avoidable skin cancer risk. Although numerous communication interventions have been assessed for IT deterrence, less attention has been paid to the persuasive messages within these interventions. This scoping review summarizes the current peer-reviewed literature on persuasive messages for IT. Overall, 20 articles (21 studies) were included. Most were experimental or quasi-experimental and conducted in the US. Participants were mostly young women who had tanned indoors before. Few studies evaluated persuasive theme; in those that did, health and appearance themes were effective. Narrative and statistical evidence formats were also effective. The included studies also supported normative messages, loss-framed messages, and images. Improved reporting on message design and evaluation would be beneficial for future evidence synthesis. Our understanding of persuasive messages for IT has expanded in recent years, but more research is needed to optimize them.

Applying persuasive messages to reduce public outdoor smoking: A pseudo-randomized controlled trial.

Despite efforts to create dedicated smoking areas and no-smoking signs, many smokers continue to light their cigarettes in front of public building entrances-leading to concerns over health consequences for non-smokers passing by. To increase compliance with no-smoking requests, behavioral interventions that tap into habitual and automatic processes seem promising. A pseudo-randomized controlled trial was conducted to assess the differential impact of seven behavioral interventions based on Cialdini's principles of persuasion. Over a period of 9 weeks, the number of smokers was counted (total n = 17,930 observations) in front of a German University Medical Center. Relative to a baseline and a control condition, interventions based on the principles of reciprocity, scarcity, and authority were most effective in reducing the number of observed smokers in front of the building entrance (41.5%, 45.7%, and 52.1% reduction rates, respectively). Having observed smokers' behavior in vivo, this study provides substantial evidence for the impact of persuasive strategies on outdoor smoking. In the future, this knowledge should be used to protect non-smokers from second-hand smoke by increasing the use of designated smoking areas, leave to another place to smoke, or not smoke at all.

"Look After Each Other"- Ethical Concerns in the Use of Communicative Appeals to Solidarity in the Face of a Pandemic.

During the recent COVID-19 pandemic international organizations and national and local governments employed appeals to solidarity or "we-messages" for the purpose of encouraging the public to adopt mitigation measures and to help more vulnerable others. Since appeals to solidarity inherently aim to influence people's views and practices, they raise ethical concerns similar to concerns associated with health communication persuasive campaigns (e.g. respect for autonomy, personal responsibility, stigmatization) and concerns more specifically associated with appeals to solidarity (e.g. divisiveness). The first part of the paper introduces a conceptual distinction between two types of approaches to solidarity according to an instrumental or moral emphasis. Appeals to solidarity according to this distinction are illustrated with examples from the COVID-19 pandemic. The second part summarizes normative justifications and advantages for employing appeals to solidarity. The third part presents ethical concerns associated with appealing to solidarity in the time of a pandemic. Drawing on these concerns, the final part presents propositions for normative conditions for employing solidarity appeals in a time of a pandemic and notes the importance of research needed to identify additional ethical concerns and conceptions of solidarity in multicultural societies. It concludes with noting the importance of employing appeals to solidarity that go beyond mitigating the pandemic and of conducting a critical discourse on the mandate of the state to make "top-down" moral demands.

Lavagem cerebral: ciência, mito e pseudociência do controle psicológico / Lavado de cerebro: ciencia, mito y pseudociencia del control psicológico / Brainwashing: science, myth, and pseudoscience of psychological control

Resumo O interesse pela possibilidade de reconfigurar a mente humana foi recorrente na história da humanidade, sob diferentes formas aliadas principalmente à religião, à guerra e à política. Somente a partir de 1950, entretanto, é que psicólogos, psiquiatras e outros pesquisadores se dedicaram com maior profundidade ao tema, popularizado pelo termo genérico de lavagem cerebral. O objetivo deste artigo é revisar as bases teórico-conceituais e metodológicas desses esforços, assim como sua manifestação atualizada na psicologia social, quando se busca a modificação de atitudes, crenças e comportamentos. São analisados criticamente os usos da lavagem cerebral para gerar mudanças significativas por técnicas de pressões psicológicas e tortura física, os mitos de sua implementação e sua (ir)reversibilidade.

Resumen El interés por la posibilidad de reconfigurar la mente humana ha sido recurrente en la historia de la humanidad, en diferentes formas, principalmente aliadas a la religión, la guerra y la política. Sin embargo, sólo después de 1950, psicólogos, psiquiatras y otros investigadores se dedicaron con mayor profundidad al tema, popularizado por el término genérico de lavado de cerebro. El objetivo de este artículo es revisar las bases teórico-conceptuales y metodológicas de estos esfuerzos, así como su manifestación actualizada en la psicología social, cuando se busca modificar actitudes, creencias y conductas. Se analizan críticamente los usos del lavado de cerebro para generar cambios significativos a través de técnicas de presión psicológica y tortura física, los mitos de su implementación y su (ir)reversibilidad.

Abstract The interest in the possibility of reconfiguring the human mind has been recurrent in the history of humanity, in different forms, mainly allied to religion, war, and politics. Only after 1950, however, did psychologists, psychiatrists, and other researchers dedicate themselves in greater depth to the topic, popularized by the generic term brainwashing. The aim of this paper is to review the theoretical-conceptual and methodological bases of these efforts, as well as their updated manifestation in social psychology, when one seeks to modify attitudes, beliefs, and behaviors. The uses of brainwashing to generate significant change through techniques of psychological pressure and physical torture, the myths of its implementation, and its (ir)reversibility, are critically analyzed.

(In)tolerância como política: os discursos de direita e de esquerda no facebook / (In)tolerance as policy: the rightist and leftist discourses on facebook / (In)tolerancia como política: los discursos de la derecha y la izquierda en facebook

Este estudo tem como objetivo analisar traços da mentalidade potencialmente autoritária a partir do discurso de usuários do Facebook vinculados a páginas de cunho político autodeclarado de direita e de esquerda no Brasil. A Netnografia é utilizada como aporte metodológico para imersão on-line nas páginas "Eu era Direita e não sabia" e "Jovens de Esquerda", selecionadas por meio do Facebook Audience Insights, ferramenta disponibilizada pelo Facebook. Delas, foram extraídas oito postagens com maior engajamento (número de comentários, curtidas e compartilhamentos), identificadas pelo Netvizz. Foram coletados 3.489 comentários, os quais foram organizados em um corpus textual submetido ao software IRAMUTEQ e analisados sob a perspectiva da análise crítica imanente da teoria crítica. Como resultado, apresenta-se a forma como o pensamento autoritário se manifesta na racionalização da sociedade contemporânea e nas práticas discursivas em redes sociais on-line, enraizada no âmbito sociopolítico brasileiro, ameaçando o processo democrático e a construção de uma sociedade plural e liberta.(AU)

This study aims to analyze traits of the potentially authoritarian mentality from the speech of Facebook users linked to political pages self-declared as rightist and leftist in Brazil. Netnography is used as a methodological contribution for online immersion in the pages "Eu era Direita e não sabia" and "Jovens de Esquerda" selected via Facebook Audience Insights, a tool provided by Facebook. From these, eight posts with greater engagement (number of comments, likes and shares), identified by Netvizz, were extracted. We collected 3,489 comments, which were organized in a textual corpus submitted to IRAMUTEQ software and analyzed from the perspective of immanent critical analysis of Critical Theory. As a result, we present the way in which authoritarian thinking manifests itself in the rationalization of contemporary society and in discursive practices in online social networks, rooted in the Brazilian socio-political sphere, threatening the democratic process and the construction of a plural and free society.(AU)

Este estudio tiene como objetivo analizar las huellas de la mentalidad potencialmente autoritaria a partir de los discursos de usuarios en Facebook vinculados a páginas políticas autodeclaradas de derecha y de izquierda en Brasil. La netnografía se utiliza como marco metodológico para la inmersión en línea en las páginas "Eu era Direita e não sabia" y "Jovens de Esquerda", seleccionadas por Facebook Audience Insights, herramienta proporcionada por Facebook. Se extrajeron las ocho publicaciones con mayor compromiso (número de comentarios, gustos y compartidas), identificadas por Netvizz. Se recogieron 3.489 comentarios, los cuales fueron organizados en un corpus textual sometido al software IRAMUTEQ y analizado bajo la perspectiva del análisis crítico inmanente de la teoría crítica. Los resultados presentan la forma en que el pensamiento autoritario se manifiesta en la racionalización de la sociedad contemporánea y en prácticas discursivas en redes sociales en línea, arraigada en el ámbito sociopolítico brasileño, que amenazan el proceso democrático y la construcción de una sociedad plural y liberada.(AU)

Using Moralization as a Persuasion Strategy in Public Health Messages: A Cross-Sectional, Experimental Study on Vaping.

Using moralization in anti-vaping public health messages as a persuasion strategy was recently recommended to address the current vaping epidemic. However, previous findings indicated this could lead to moralized attitudes in the general population, which can be very difficult to change and could severely affect social cohesion and distort risk perception. Since the safety and efficiency of using electronic cigarettes as smoking cessation devices are still being investigated, we conducted a cross-sectional, experimental study on a convenience sample of 612 Romanian never vapers, never smokers to assess how exposure to moralizing public health messages about vaping might influence their trust in future scientific results about this topic. Participants were randomized into six groups according to the type of message ("moral," "immoral," "neutral") and the type of effects of vaping on smokers' health, documented in a future fictitious study ("health benefits," "health risks"). Results showed that the type of message moderated trust in future scientific results after controlling for participants' general trust in science. When vaping was framed as immoral, trust in future scientific results showing health benefits was decreased, and vice versa. Implications are discussed for using moralization strategically in public health messaging to curtail or promote certain health behaviors.

Effects of Fear and Humor Appeals in Public Service Announcements (PSAs) on Intentions to Purchase Medications via Social Media.

The increasing prevalence of online purchase of medications, specifically via social media platforms, poses significant health risks due to high chances of such medications being substandard and falsified (SF). The current study uses a 2 (persuasive appeal: fear vs. humor) x 3 (message repetition) mixed factorial experiment to investigate the effectiveness of persuasive appeals (on intentions to purchase medications online via social media referrals, mediated by psychological reactance (threat to freedom and anger), attitudes toward the public service announcements (PSAs), and viral behavioral intentions. ANOVA results showed the superiority of humor appeals compared to fear appeals in (1) reducing psychological reactance, (2) igniting favorable responses to the PSA, and (3) marginally reducing the intentions to purchase medications vial social media despite lower online engagement intentions (viral behavioral intentions). Pre-existing risk perceptions moderated these differences. A moderated serial mediation model, conducted using PROCESS models, was examined to assess the mechanism by which persuasive appeals and risk perceptions interact in influencing purchase intentions. Findings are discussed theoretically in regard to extending the psychological reactance model within the digital environment and practically in terms of public health, brand protection, and law enforcement recommendations.

"I Felt Completely Turned off by the Message": The Effects of Controlling Language, Fear, and Disgust Appeals on Responses to COVID-19 Vaccination Messages.

Psychological reactance theory (PRT) posits that when individuals' perceived freedoms are threatened or restricted, they become aversively aroused and are motivated to reestablish those freedoms, leading to a state of psychological reactance. Applying PRT, this study examined the effects of controlling language, fear, and disgust appeals on responses to COVID-19 vaccination promotion messages. Participants were randomly assigned to one of eight conditions across controlling language (high/low), fear appeals (high/low), and disgust appeals (high/low), wherein they viewed two messages, with responses measured after each message. Results showed persuasion was diminished when the levels of any of these three variables were elevated, as in conditions of either high controlling language, high fear appeals, or high disgust appeals. Relative to low levels of these variables, high levels resulted in greater freedom threat perceptions, reactance, source derogation, and less positive attitudes toward the message. A 2-way interaction between fear and disgust appeals on source derogation and message attitudes in the low controlling language condition was significant-participants reported the least source derogation and most positive attitudes toward the message in response to the low controlling language, low fear, and low disgust appeals.

Effect of combining fear and anger in anti-smoking messages to discourage young smokers.

OBJECTIVES: Previous studies have reported mixed results in reducing the prevalence of tobacco use among young people. The present study investigates the influence of a combined emotions (fear and anger) approach to strengthen the persuasive impact of anti-smoking messages aimed at young smokers. STUDY DESIGN: The study adopts a between-subject design experiment. METHODS: Participants were exposed to either a fear appeal or a fear and anger appeal message, after which they answered questions about their emotions, perceived message effectiveness, and intention to reduce cigarette consumption and to quit smoking. An original measure of the co-occurrence of emotions felt by the participants (minimum [MIN] score) was used and mediation analyses were conducted to test the relationship between the emotional content of the message and behavioral intentions through the co-occurrence of fear and anger and perceived message effectiveness. RESULTS: The findings show that the co-occurrence of fear and anger felt by individuals and perceived message effectiveness serially mediate the positive influence of a fear and anger appeal message compared to a fear alone appeal on changes in intention behavior (intention to reduce cigarette consumption, indirect effect = 0.152, 95% confidence interval (CI) [0.014, 0.340], and intention to quit smoking, indirect effect = 0.236, 95% CI [0.096, 0.413]). CONCLUSIONS: The study shows the interest of combining negative emotions in prevention messages and offers guidance for government agencies responsible for tobacco control policies to help them improve the effectiveness of anti-smoking messages.

Persuasion via Performance: Toward a Handbook for Youth to Develop Content that Promotes HPV Vaccination.

Slightly over half of American teens are fully vaccinated against the human papillomavirus, or HPV. The vaccine is protective against 90% of cancers caused by HPV, including cancers of the vagina, vulva, and cervix in women, the penis in men, and cancers of the throat and anus in both men and women. While HPV vaccination rates are on the rise, rural areas lag significantly behind. There are several reasons why, and there are multiple strategies that can increase vaccination rates. This article discusses the process of creating a writer's handbook to enable youth writers and producers to create provaccination, short-form dramatic stories in podcast format, and to distribute and promote them via social media to their peers. The objective is to prompt students to get their HPV vaccination. The article concludes with examples that will be part of this handbook.

Show Me a Photo of the Character: Exploring the Interaction between Text and Visuals in Narrative Persuasion.

The use of narrative text in health messaging has been ubiquitous. With the popularity of promoting public health on social media, it becomes critical to investigate what visual images should be used to maximize the impact of narrative health-related posts. This study focused on messages designed to communicate the breast cancer risk associated with alcohol use. We conducted a 2 (text: narrative vs. non-narrative) x 2 (visuals: exemplar vs. non-exemplar) between-subjects online experiment (N = 299). Our results showed that narrative (vs. non-narrative) text led to greater attention, stronger negative emotions, and higher intentions to seek information about alcohol use and cancer among female drinkers. The visual exemplar (vs. non-exemplar) also produced higher intentions to seek information and reduce alcohol use. More importantly, including a visual exemplar (vs. non-exemplar) significantly increased negative emotions and subsequently behavioral intentions when the text was a narrative, but the visual content did not make a difference when the text was a non-narrative. The results of this study show the importance of adding a relevant visual exemplar to narrative text, such as a photo of the character, to improve message effectiveness.

Are some narratives better than others?: The impact of different narrative forms on adolescents' intentions to text and drive.

Psychological reactance theory posits individuals seek to restore freedom when threatened. Communication scholars have hypothesized persuasive messages can constitute threats to freedom. The current study engages questions about the potential for different forms of narratives in public service announcements (PSAs) to trigger freedom threats by examining responses to a PSA campaign that utilized three forms of narrative (celebrity testimonials, peer testimonials, and accident stories) to decrease adolescent texting and driving intentions. Participants (N = 214) watched anti-texting and driving narratives, and completed measures of threat to freedom, anger, negative cognition, and attitudes/intentions toward texting/driving. Compared to celebrity/peer testimonial PSAs, accident stories triggered increased anger and, indirectly, decreased intentions to drive safely. The results also suggest the need for continued examination of the best way to model psychological reactance theory, and the value of further research explicating anger as a mechanism of message effects.

Effects of narratives, frames, and involvement on health message effectiveness.

An online 2 (evidence type: narrative vs. informational) × 2 (message frame: gain vs. loss) × 2 (involvement: low vs. high) between-subjects factorial experiment was conducted to examine their effects in skin cancer awareness campaigns. Results showed that loss-framed narratives were convincing for high-involved individuals, whereas both gain-framed informational and loss-framed narratives evoked higher issue attitudes and behavioral intentions for low-involved ones. Mediation analyses showed that identification with the story protagonist mediated narrative effects on the outcome variables. Theoretical and practical implications for sun protection awareness campaigns are discussed.

Persuasive communication in medical decision-making during consultations with patients with limited health literacy in hospital-based palliative care.

OBJECTIVE: Both patients in the palliative phase of their disease and patients with limited health literacy (LHL) have an increased risk of being influenced by healthcare providers (HCPs) when making decisions. This study aims to explore to what extent persuasive communication occurs during shared decision-making (SDM) by (1) providing an overview of persuasive communication behaviours relevant for medical decision-making and (2) exemplifying these using real-life outpatient consultations. METHODS: An exploratory qualitative design was applied: (1) brief literature review; (2) analysis of verbatim extracts from outpatient consultations and stimulated recall sessions with HCPs; and (3) stakeholder meetings. RESULTS: 24 different persuasive communication behaviours were identified, which can be divided in seven categories: biased presentation of information, authoritative framing, probability framing, illusion of decisional control, normative framing, making assumptions and using emotions or feelings. CONCLUSIONS: Persuasive communication is multi-faceted in outpatient consultations. Although undesirable, it may prove useful in specific situations making it necessary to study the phenomenon more in depth and deepen our understanding of its mechanisms and impact. PRACTICE IMPLICATIONS: Awareness among HCPs about the use of persuasive communication needs to be created through training and education. Also, HCPs need help in providing balanced information.

Influence of online comments on smokers' E-cigarette attitude: Opinion climate, review fraud, and resistance to persuasion.

OBJECTIVE: This study examined the effect of online comments on smokers' attitude toward trying e-cigarettes. It also explored the effect of an unobtrusive forewarning in increasing smokers' resistance to online review fraud. DESIGN: 739 adult smokers participated in an experiment with a 2 comment valence (supportive vs. oppositional) x 3 comment deception warning (no warning vs. early warning vs. late warning) + 1 control (no comment) factorial design. Smokers watched two e-cigarette commercials. The control group received only the ads. The treatment groups saw 10 to 12 comments following each ad.Main Outcome Measure: E-cigarette attitude. RESULTS: Smokers who read supportive (M = 5.28, SD = 1.37), oppositional (M = 4.96, SD = 1.53), and no comment (M = 5.44, SD = 1.20) showed significant difference on their e-cigarettes attitude, p = .004. When the comment climate was overly in favor of e-cigarettes, warning smokers of review fraud could raise their awareness of comment deception, increase defensive processing, decrease their social identification with commenters, and eventually lower their interest in trying e-cigarettes. CONCLUSION: The overall opinion climate in the form of aggregated valence of comments could sway smokers' e-cigarette attitude. Smokers could benefit from warnings of online review fraud.