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Purpose: Endorsement marketing has been widely used to generate consumer attention, interest and purchase decisions among targeted audiences. Internet celebrities who become famous on the Internet are dependent on strategic intimacy to appeal to their followers. Our study aims to examine how multiple exposures to Internet celebrity endorsements influence consumers' click and purchase decisions in the context of influencer marketing. Design/methodology/approach: Based on a unique and representative dataset, the authors first model consumers' choices for clicks and purchases with two panel fixed-effect logit models linking clicks and purchases with the frequency of exposure to Internet celebrity endorsement. To further control the endogeneity produced by the intercorrelation between the click and purchase models, the authors also adopt the two-stage Heckman probit structure to jointly estimate the two models using Maximum Likelihood Estimation. Robustness checks confirm the effectiveness of the models. Findings: The results suggest that Internet celebrity endorsement plays a significant role in bringing referral traffic to e-commerce sites but is less helpful in affecting conversion to sales. The impact of repetitive Internet celebrity endorsements on consumers' click decisions is U-shaped, but the role of Internet celebrities as online retailers will "shape-flip" this relationship to a negative linear relation. Originality/value: Our study is the first to investigate the repetitive exposure effect of Internet celebrity endorsement. The results show a contradictory pattern with a wear-out effect of repetition in the advertising literature. This is the first study to show how the endorsing self, which is a common business model in influencer marketing, moderates the effectiveness of influencer marketing. [ABSTRACT FROM AUTHOR]

Purpose: Drawing upon attribution theory, this study aims to examine how different types of product information sources (mainstream celebrities vs micro-celebrities) interact with content type (experiential vs promotional) to influence consumer response toward native posts on social media (causal attributions and click intention). Design/methodology/approach: A total of 134 adult Twitter users participated in a 2 (source type: mainstream celebrity vs micro-celebrity) × 2 (content type: experiential vs promotional) between-subjects online experimental design. Findings: Results showed that for experiential native advertising, messages from a micro-celebrity generated more information-sharing attributions and less monetary gain attributions than those from a mainstream celebrity on social media. Moreover, the experiential native ads from a micro-celebrity elicited greater intention to click the URL than those from a mainstream celebrity. However, consumer response was similar for promotional native advertising regardless of message source. This study demonstrates that information-sharing attributions mediate the interaction effects of source type and content types on click intention. Originality/value: This study contributes to the literature on native advertising by providing empirical evidence to highlight the effect of message source and content type on consumer response. This study shows that the success of native advertising depends on how consumers perceive the messages and content creators' intention to communicate. [ABSTRACT FROM AUTHOR]