本文對社交網站傳遞的產品品質信號進行實證。我們以「朋友」和「讚」的線索來衡量它們對產品品質認知的影響，並同時研究熟悉度、認知風險和評論效價的調節作用。透過兩個Facebook實驗，我們首先比較了朋友、朋友的朋友、和廣告所提供的資訊之影響。結果表明，品質認知會受到社交信號的影響而帶來購買意願。「朋友」線索的影響受到熟悉度和風險的正向調節。然而，「讚」對品質認知的影響在不同的熟悉度和風險中沒有明顯的差異。接著，我們區分正面和負面評論以探討資訊效價的影響。結果顯示，在負面評論下，朋友和衍生朋友的線索所產生的信號之影響並沒有差異；「讚」的數量也是一樣的結果。亦即，對負面評論的評斷會遮蓋掉好友類型和評級數量的影響。

This study examines the signals of product quality transmitted on social network sites. We use the cues friend and like as measurements to determine their influence on perceived product quality and the moderating role of familiarity, perceived risk, and review valence. The hypotheses were tested using two Facebook field experiments. We first compared the effects of information provided by friends, friends of friends, and advertisements. The results indicate that social signals affect perceived product quality, which produces intentions to purchase. The effect of friend cues is positively moderated by perceived familiarity and risk. Nevertheless, like does not make a noticeable difference on perceived quality for varying perceived familiarity and risk. We then studied the effect of information valence by differentiating between positive and negative reviews. The results indicate that the power of signals produced by friends’ and derived friends’ cues does not differ under negative review situations; the same result was found for like volume. The judgment of negative reviews overshadows both friendship type and rating volume effects.

Adams, P., 2011, Grouped: How Small Groups of Friends Are the Key to Influence on the Social Web, 1st, Berkeley, CA: New Riders.
Ahluwalia, R., 2002, “How Prevalent Is the Negativity Effect in Consumer Environments?,” Journal of Consumer Research, Vol. 29, No. 2, 270-279.
Aiken, L. S. and West, S. G., 1991, Multiple Regression: Testing and Interpreting Interactions, 1st, Thousand Oaks, CA: Sage.
Akerlof, G. A., 1970, “The Market for “Lemons”: Quality Uncertainty and the Market Mechanism,” Quarterly Journal of Economics, Vol. 84, No. 3, 488-500.
Allen, T. J., 1977, Managing the Flow of Technology: Technology Transfer and the Dissemination of Technological Information within the R&D Organisation, 1st, Cambridge, MA: MIT Press.
Aronson, E. and Aronson, J., 2018, The Social Animal, 12th, New York, NY: Worth Publishers.
Bai, Y., Yao, Z., and Dou, Y.-F., 2015, “Effect of Social Commerce Factors on User Purchase Behavior: An Empirical Investigation from Renren.Com,” International Journal of Information Management, Vol. 35, No. 5, 538-550.
Basuroy, S., Chatterjee, S., and Ravid, S. A., 2003, “How Critical Are Critical Reviews? The Box Office Effects of Film Critics, Star Power, and Budgets,” Journal of Marketing, Vol. 67, No. 4, 103-117.
Bettman, J. R., 1973, “Perceived Risk and Its Components: A Model and Empirical Test,” Journal of Marketing Research, Vol. 10, No. 2, 184-190.
Bhandari, M. and Rodgers, S., 2018, “What Does the Brand Say? Effects of Brand Feedback to Negative Ewom on Brand Trust and Purchase Intentions,” International Journal of Advertising, Vol. 37, No. 1, 125-141.
Biyalogorsky, E., Gerstner, E., and Libai, B., 2001, “Customer Referral Management: Optimal Reward Programs,” Marketing Science, Vol. 20, No. 1, 82-95.
Boulding, W. and Kirmani, A., 1993, “A Consumer-Side Experimental Examination of Signaling Theory: Do Consumers Perceive Warranties as Signals of Quality?,” Journal of Consumer Research, Vol. 20, No. 1, 111-123.
Brown, J. J. and Reingen, P. H., 1987, “Social Ties and Word-of-Mouth Referral Behavior,” Journal of Consumer Research, Vol. 14, No. 3, 350-362.
Bugshan, H. and Attar, R. W., 2020, “Social Commerce Information Sharing and Their Impact on Consumers,” Technological Forecasting and Social Change, Vol. 153, 119875.
Burnkrant, R. E. and Cousineau, A., 1975, “Informational and Normative Social Influence in Buyer Behavior,” Journal of Consumer Research, Vol. 2, No. 3, 206-215.
Campbell, M. C. and Keller, K. L., 2003, “Brand Familiarity and Advertising Repetition Effects,” Journal of Consumer Research, Vol. 30, No. 2, 292-304.
Centola, D., 2010, “The Spread of Behavior in an Online Social Network Experiment,” Science, Vol. 329, No. 5996, 1194-1197.
Centola, D., 2018, How Behavior Spreads: The Science of Complex Contagions, 1st, New Jersey: Princeton University Press.
Cheng, X., Gu, Y., and Shen, J., 2019, “An Integrated View of Particularized Trust in Social Commerce: An Empirical Investigation,” International Journal of Information Management, Vol. 45, 1-12.
Chevalier, J. A. and Mayzlin, D., 2006, “The Effect of Word of Mouth on Sales: Online Book Reviews,” Journal of Marketing Research, Vol. 43, No. 3, 345-354.
Chu, S.-C. and Kim, J., 2018, “The Current State of Knowledge on Electronic Word-of- Mouth in Advertising Research,” International Journal of Advertising, Vol. 37, No. 1, 1-13.
Cialdini, R. B., 2001, “Harnessing the Science of Persuasion,” Harvard Business Review, Vol. 79, No. 9, 72-81.
Coyle, J. R. and Thorson, E., 2001, “The Effects of Progressive Levels of Interactivity and Vividness in Web Marketing Sites,” Journal of Advertising, Vol. 30, No. 3, 65-77.
Cui, G., Lui, H.-K., and Guo, X., 2012, “The Effect of Online Consumer Reviews on New Product Sales,” International Journal of Electronic Commerce, Vol. 17, No. 1, 39-58.
Dodds, W. B., Monroe, K. B., and Grewal, D., 1991, “Effects of Price, Brand, and Store Information on Buyers’ Product Evaluations,” Journal of Marketing Research, Vol. 28, No. 3, 307-319.
Dowling, G. R. and Staelin, R., 1994, “A Model of Perceived Risk and Intended Risk- Handling Activity,” Journal of Consumer Research, Vol. 21, No. 1, 119-134.
Duan, W., Gu, B., and Whinston, A. B., 2008, “The Dynamics of Online Word-of-Mouth and Product Sales—an Empirical Investigation of the Movie Industry,” Journal of Retailing, Vol. 84, No. 2, 233-242.
East, R., Hammond, K., Lomax, W., and Robinson, H., 2005, “What Is the Effect of a Recommendation?,” The Marketing Review, Vol. 5, No. 2, 145-157.
Ensing, D. S., 2014, “How Marketers Can Determine True Customer Experience from Review-Based Websites,” Marketing Insights, Vol. 26, No. 1, 31-33
Ganzach, Y., Ellis, S., Pazy, A., and Ricci-Siag, T., 2008, “On the Perception and Operationalization of Risk Perception,” Judgment and Decision Making, Vol. 3, No. 4, 317-324.
Gorner, J., Zhang, J., and Cohen, R., 2013, “Improving Trust Modeling through the Limit of Advisor Network Size and Use of Referrals,” Electronic Commerce Research and Applications, Vol. 12, No. 2, 112-123.
Granovetter, M. S. and Soong, R., 1988, “Threshold Models of Diversity: Chinese Restaurants, Residential Segregation, and the Spiral of Silence,” Sociological Methodology, Vol. 18, 69-104.
Hair, J. F., Black, W. C., Babin, B. J., and Anderson, R. E., 2018, Multivariate Data Analysis, 8th, United Kingdom: Cengage Learning.
Harris, M. A., Brookshire, R., and Chin, A. G., 2016, “Identifying Factors Influencing Consumers’ Intent to Install Mobile Applications,” International Journal of Information Management, Vol. 36, No. 3, 441-450.
Henry, W. A., 1980, “The Effect of Information-Processing Ability on Processing Accuracy,” Journal of Consumer Research, Vol. 7, No. 1, 42-48.
Hinton, P. R., McMurray, I., and Brownlow, C., 2014, SPSS Explained, 2nd, New York, NY: Routledge.
Hong, H., Xu, D., Wang, G. A., and Fan, W., 2017, “Understanding the Determinants of Online Review Helpfulness: A Meta-Analytic Investigation,” Decision Support Systems, Vol. 102, 1-11.
Ilgen, D. R., Fisher, C. D., and Taylor, M. S., 1979, “Consequences of Individual Feedback on Behavior in Organizations,” Journal of Applied Psychology, Vol. 64, No. 4, 349-371.
Jacoby, J., Jaccard, J. J., Currim, I., Kuss, A., Ansari, A., and Troutman, T., 1994, “Tracing the Impact of Item-by-Item Information Accessing on Uncertainty Reduction,” Journal of Consumer Research, Vol. 21, No. 2, 291-303.
Jiang, Z. and Benbasat, I., 2007, “Investigating the Influence of the Functional Mechanisms of Online Product Presentations,” Information Systems Research, Vol. 18, No. 4, 454-470.
Karahasanović, A., Brandtzæg, P. B., Heim, J., Lüders, M., Vermeir, L., Pierson, J., Lievens, B., Vanattenhoven, J., and Jans, G., 2009, “Co-Creation and User-Generated Content–Elderly People’s User Requirements,” Computers in Human Behavior, Vol. 25, No. 3, 655-678.
Kardes, F. R., Kim, J., and Lim, J.-S., 2001, “Consumer Expertise and the Perceived Diagnosticity of Inference,” Advances in Consumer Research, Vol. 19, No. 1, 409-410.
Kempf, D. S. and Smith, R. E., 1998, “Consumer Processing of Product Trial and the Influence of Prior Advertising: A Structural Modeling Approach,” Journal of Marketing Research, Vol. 35, No. 3, 325-338.
Kent, R. J. and Allen, C. T., 1994, “Competitive Interference Effects in Consumer Memory for Advertising: The Role of Brand Familiarity,” Journal of Marketing, Vol. 58, No. 3, 97-105.

Kim, K., Ma, X., and Kim, S., 2013. Moderating Roles of Review Credibility and Author Popularity on Book Sales, Proceedings of the 19th Americas Conference on Information Systems, Chicago, USA.
Kim, N. and Kim, W., 2018, “Do Your Social Media Lead You to Make Social Deal Purchases? Consumer-Generated Social Referrals for Sales Via Social Commerce,” International Journal of Information Management, Vol. 39, 38-48.
Kim, S. J., Maslowska, E., and Malthouse, E. C., 2018, “Understanding the Effects of Different Review Features on Purchase Probability,” International Journal of Advertising, Vol. 37, No. 1, 29-53.
Kirmani, A. and Rao, A. R., 2000, “No Pain, No Gain: A Critical Review of the Literature on Signaling Unobservable Product Quality,” Journal of Marketing, Vol. 64, No. 2, 66-79.
Kuusela, H., Spence Mark, T., and Kanto Antti, J., 1998, “Expertise Effects on Prechoice Decision Processes and Final Outcomes: A Protocol Analysis,” European Journal of Marketing, Vol. 32, No. 5/6, 559-576.
Li, X., Wu, C., and Mai, F., 2019, “The Effect of Online Reviews on Product Sales: A Joint Sentiment-Topic Analysis,” Information & Management, Vol. 56, No. 2, 172-184.
Lian, J.-W. and Lin, T.-M., 2008, “Effects of Consumer Characteristics on Their Acceptance of Online Shopping: Comparisons among Different Product Types,” Computers in Human Behavior, Vol. 24, No. 1, 48-65.
Liang, T.-P., Ho, Y.-T., Li, Y.-W., and Turban, E., 2011, “What Drives Social Commerce: The Role of Social Support and Relationship Quality,” International Journal of Electronic Commerce, Vol. 16, No. 2, 69-90.
Liang, T.-P. and Turban, E., 2011, “Introduction to the Special Issue Social Commerce: A Research Framework for Social Commerce,” International Journal of Electronic Commerce, Vol. 16, No. 2, 5-14.
Liang, T.-P., Li, X., Yang, C.-T., and Wang, M., 2015, “What in Consumer Reviews Affects the Sales of Mobile Apps: A Multifacet Sentiment Analysis Approach,” International Journal of Electronic Commerce, Vol. 20, No. 2, 236-260.
Lichtenstein, S. and Fischhoff, B., 1977, “Do Those Who Know More Also Know More About How Much They Know?,” Organizational Behavior and Human Performance, Vol. 20, No. 2, 159-183.
Liu, L., Lee, M. K. O., Liu, R., and Chen, J., 2018, “Trust Transfer in Social Media Brand Communities: The Role of Consumer Engagement,” International Journal of Information Management, Vol. 41, 1-13.
Liu, Y., 2006, “Word of Mouth for Movies: Its Dynamics and Impact on Box Office Revenue,” Journal of Marketing, Vol. 70, No. 3, 74-89.
Lu, B., Fan, W., and Zhou, M., 2016, “Social Presence, Trust, and Social Commerce Purchase Intention: An Empirical Research,” Computers in Human Behavior, Vol. 56, 225-237.
Maheswaran, D., 1994, “Country of Origin as a Stereotype: Effects of Consumer Expertise and Attribute Strength on Product Evaluations,” Journal of Consumer Research, Vol. 21, No. 2, 354-365.
Maheswaran, D., Sternthal, B., and Gürhan, Z., 1996, “Acquisition and Impact of Consumer Expertise,” Journal of Consumer Psychology, Vol. 5, No. 2, 115-133.
Mehta, A., 2000, “Advertising Attitudes and Advertising Effectiveness,” Journal of Advertising Research, Vol. 40, No. 3, 67-72.
Metzger, M. J., Flanagin, A. J., and Medders, R. B., 2010, “Social and Heuristic Approaches to Credibility Evaluation Online,” Journal of Communication, Vol. 60, No. 3, 413-439.
Mintzberg, H. 1973, The Nature of Managerial Work, 1st, Englewood Cliffs, NJ: Prentice-Hall.
Muchnik, L., Aral, S., and Taylor, S. J., 2013, “Social Influence Bias: A Randomized Experiment,” Science, Vol. 341, No. 6146, 647-651.
Ng, C. S.-P., 2013, “Intention to Purchase on Social Commerce Websites across Cultures: A Cross-Regional Study,” Information & Management, Vol. 50, No. 8, 609-620.
Nunnally, J. C. and Bernstein, I. H., 1994, Psychometric Theory, 3rd, New York, NY: McGraw-Hill.
Park, D.-H., Lee, J., and Han, I., 2007, “The Effect of on-Line Consumer Reviews on Consumer Purchasing Intention: The Moderating Role of Involvement,” International Journal of Electronic Commerce, Vol. 11, No. 4, 125-148.
Petty, R. E. and Cacioppo, J. T., 1986. The Elaboration Likelihood Model of Persuasion, In Communication and Persuasion: Central and Peripheral Routes to Attitude Change, 1st, New York, NY: Springer, 1-24.
Phua, J. and Ahn, S. J., 2016, “Explicating the ‘Like’ on Facebook Brand Pages: The Effect of Intensity of Facebook Use, Number of Overall ‘Likes’, and Number of Friends' ‘Likes’ on Consumers' Brand Outcomes,” Journal of Marketing Communications, Vol. 22, No. 5, 544-559.
Rao, A. R. and Monroe, K. B., 1988, “The Moderating Effect of Prior Knowledge on Cue Utilization in Product Evaluations,” Journal of Consumer Research, Vol. 15, No. 2, 253-264.
Rao, A. R., Qu, L., and Ruekert, R. W., 1999, “Signaling Unobservable Product Quality through a Brand Ally,” Journal of Marketing Research, Vol. 36, No. 2, 258-268.
Richardson, P. S., Dick, A. S., and Jain, A. K., 1994, “Extrinsic and Intrinsic Cue Effects on Perceptions of Store Brand Quality,” Journal of Marketing, Vol. 58, No. 4, 28-36.
Rogers, E. M., 2003, Diffusion of Innovations, 5th, New York, NY: Free Press.
Salehan, M., Kim, D. J., and Kim, C., 2017, “Use of Online Social Networking Services from a Theoretical Perspective of the Motivation-Participation-Performance Framework,” Journal of the Association for Information Systems, Vol. 18, No. 2, 142-172.
Sarkar, S., Chauhan, S., and Khare, A., 2020, “A Meta-Analysis of Antecedents and Consequences of Trust in Mobile Commerce,” International Journal of Information Management, Vol. 50, 286-301.
Shih, C., 2010, The Facebook Era: Tapping Online Social Networks to Market, Sell, and Innovate, 2nd, Boston, MA: Pearson Education.
Siu, Y. M. and Wong, H. Y., 2002, “The Impact of Product‐Related Factors on Perceived Product Safety,” Marketing Intelligence Planning, Vol. 20, No. 3, 185-194.
Skowronski, J. J. and Carlston, D. E., 1989, “Negativity and Extremity Biases in Impression Formation: A Review of Explanations,” Psychological Bulletin, Vol. 105, No. 1, 131-142.
Spence, A. M., 1973, “Job Market Signaling,” Quarterly Journal of Economics, Vol. 87, 355-374.
Spence, A. M., 1974, Market Signaling: Informational Transfer in Hiring and Related Screening Processes, 1st, Cambridge, MA: Harvard University Press.
Sullivan, Y. W. and Kim, D. J., 2018, “Assessing the Effects of Consumers’ Product Evaluations and Trust on Repurchase Intention in E-Commerce Environments,” International Journal of Information Management, Vol. 39, 199-219.
Utz, S., Kerkhof, P., and van den Bos, J., 2012, “Consumers Rule: How Consumer Reviews Influence Perceived Trustworthiness of Online Stores,” Electronic Commerce Research and Applications, Vol. 11, No. 1, 49-58.
Wang, J.-C. and Chang, C.-H., 2013, “How Online Social Ties and Product-Related Risks Influence Purchase Intentions: A Facebook Experiment,” Electronic Commerce Research and Applications, Vol. 12, No. 5, 337-346.
Wang, S., Cunningham, N. R., and Eastin, M. S., 2015, “The Impact of Ewom Message Characteristics on the Perceived Effectiveness of Online Consumer Reviews,” Journal of Interactive Advertising, Vol. 15, No. 2, 151-159.
Wells, J. D., Valacich, J. S., and Hess, T. J., 2011, “What Signal Are You Sending? How Website Quality Influences Perceptions of Product Quality and Purchase Intentions,” MIS Quarterly, Vol. 35, No. 2, 373-396.
White, K. and Simpson, B., 2013, “When Do (and Don't) Normative Appeals Influence Sustainable Consumer Behaviors?,” Journal of Marketing, Vol. 77, No. 2, 78-95.
Xiao, B., Huang, M., and Barnes, A. J., 2015, “Network Closure among Sellers and Buyers in Social Commerce Community,” Electronic Commerce Research and Applications, Vol. 14, No. 6, 641-653.
Yang, K., Kim, H. M., and Tanoff, L., 2020, “Signaling Trust: Cues from Instagram Posts,” Electronic Commerce Research and Applications, Vol. 43, 100998.
Zeithaml, V. A., 1988, “Consumer Perceptions of Price, Quality, and Value: A Means-End Model and Synthesis of Evidence,” Journal of Marketing, Vol. 52, No. 3, 2-22.
Zhang, H. and Li, H., 2006, “Factors Affecting Payment Choices in Online Auctions: A Study of Ebay Traders,” Decision Support Systems, Vol. 42, No. 2, 1076-1088.