Celebrities frequently endorse products, brands, political candidates, or health campaigns. We investigated the effectiveness of such endorsements by meta-analyzing 46 studies published until April 2016 involving 10,357 participants. Applying multilevel meta-analysis, we analyzed celebrity endorsements in the context of for-profit and non-profit marketing. Findings revealed strong positive and negative effects when theoretically relevant moderators were included in the analysis. The most positive attitudinal effect appeared for male actors who match well with an implicitly endorsed object (d = .90). The most negative effect was found for female models not matching well with an explicitly endorsed object (d = −.96). Furthermore, celebrity endorsements performed worse compared to endorsements of quality seals, awards, or endorser brands. No publication bias was detected. The study has theoretical and practical implications, and provides an agenda for future research.
Although studies suggest that the use of social media can promote political participation (PP), there is a lack of theorizing about the psychological processes underlying this relationship. This article attempts to fill this gap by suggesting a social media political participation model. Taking a goal systemic perspective, the model specifies a set of interrelated processes that need to be realized so that social media use affects PP. Furthermore, key contingent conditions are outlined and insights into fostering PP are offered. The article explains ways of testing the model with surveys and experiments. Implications for future research are discussed.
The key assumption of spiral of silence theory is that opinion climate perceptions affect political opinion expression. We meta-analyzed the strength of this relationship and clarified the impact of theoretically relevant moderators. Sixty-six studies collectively including more than 27,000 participants were located. We observed a significant positive relationship (r = .10; Zr = .10) between opinion climate and opinion expression. This relationship was not weaker in online as compared with offline opinion expression environments. Also, the relationship did not vary by the number of the targets of opinion expression, the opinion of the targets, the opinion climate characteristics, and the design, measurement, and sample characteristics. The largest silencing effect (r = .34), however, was observed when participants talk to their family, friends, or neighbors about obtrusive issues. Overall, our findings suggest that the relationship between opinion climate perception and political opinion expression is stronger and more robust than previously thought.
Objectification theorists suggest that exposure to sexualizing media increases self-objectification among individuals. Correlational and experimental research examining this relation has received growing attention. The aim of this meta-analysis was to investigate the influence of sexualizing media use on self-objectification among women and men. For this purpose, we analyzed 54 papers yielding 50 independent studies and 261 effect sizes. The data revealed a positive, moderate effect of sexualizing media on self-objectification (r = .19). The effect was significant and robust, 95% CI [.15, .23], p < .0001. We identified a conditional effect of media type, suggesting that the use of video games and/or online media led to stronger self-objectification effects when compared to television use. Other sample characteristics or study characteristics did not moderate the overall effect. Thus, our findings highlight the importance of sexualizing media exposure on women’s and men’s objectified self-concept. We discuss future research directions and implications for practice. We hope that the article will stimulate researchers in their future work to address the research gaps outlined here. Moreover, we hope that the findings will encourage practitioners and parents to reflect on the role of the use of sexualizing media in the development of individuals’ self-objectification. Additional online materials for this article are available on PWQ’s website at http://journals.sagepub.com/doi/suppl10.1177/0361684317743019
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