A Theory of Viral Growth of Social Networking Sites
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A THEORY OF VIRAL GROWTH OF SOCIAL NETWORKING SITES by MICHAEL T. FISHER Submitted in partial fulfillment of the requirements For the degree of Doctor of Philosophy Dissertation Committee: Kalle J. Lyytinen, Ph.D., Case Western Reserve University (chair) Dick Boland, Ph.D., Case Western Reserve University Jerry Kane, Ph.D., Boston College Rakesh Niraj, Ph.D., Case Western Reserve University Toni M. Somers, Ph.D., Wayne State University Weatherhead School of Management Designing Sustainable Systems CASE WESTERN RESERVE UNIVERSITY May, 2013 CASE WESTERN RESERVE UNIVERSITY SCHOOL OF GRADUATE STUDIES We hereby approve the thesis/dissertation of Michael T. Fisher candidate for the Doctor of Philosophy degree* (signed) Kalle Lyytinen (chair of the committee) Richard J. Boland Gerald Kane Rakesh Niraj Toni Somers (date) November 29, 2012 * We also certify that written approval has been obtained for any proprietary material contained therein. ii TABLE OF CONTENTS Acknowledgements ............................................................................................................ ix Abstract .............................................................................................................................. xi Introduction ..........................................................................................................................1 Motivation and Outline ................................................................................................. 1 Literature Review.................................................................................................................5 Defining Platforms ........................................................................................................ 6 The Nature of Growth on SNS Platforms ..................................................................... 8 Co-creation and Co-production Processes on SNS Platforms .................................... 13 Individual Motivations for UGC ................................................................................. 15 Individual Attitudes towards SNS .............................................................................. 17 Two-Sided Markets ..................................................................................................... 21 Theoretical Framing ...........................................................................................................25 What Is Known ........................................................................................................... 28 What Is Not Known .................................................................................................... 29 Research Methodology ......................................................................................................31 Research Design.......................................................................................................... 31 Qualitative Strand ....................................................................................................... 37 Quantitative Strand ..................................................................................................... 38 Overview of Main Results .................................................................................................40 Paper 1: The Co-Production of Viral Growth: A Comparative Analysis of Two Social Networking Sites ........................................................................................ 40 Paper 2: The Antecedents of Viral Growth on Social Networking Platforms ............ 41 iii Perceived ease of use. ........................................................................................... 43 Page load time. ...................................................................................................... 43 Co-production. ...................................................................................................... 43 Self-identity........................................................................................................... 44 Paper 3: The Influence of User Mix on the Viral Growth of Social Networking Sites .................................................................................................................... 44 Summary of Findings .................................................................................................. 45 Conclusions ........................................................................................................................46 Discussion ................................................................................................................... 46 Understanding self-identity and social behaviors. ................................................ 47 Reciprocity of user generated content................................................................... 49 Differences in platform behaviors and learning.................................................... 50 Social exchange model. ........................................................................................ 52 Intrinsic vs. extrinsic. ............................................................................................ 53 Implications for Practitioners ...................................................................................... 54 Misuse or bricolage. .............................................................................................. 55 Motivations of users. ............................................................................................. 56 Limitations and Future Research ................................................................................ 57 Qualitative strand. ................................................................................................. 58 Quantitative strand. ............................................................................................... 59 Mixed methods research design. ........................................................................... 60 Future research. ..................................................................................................... 62 iv Appendixes Appendix A: Alexa Ranking .................................................................................65 Appendix B: The Co-Production of Viral Growth: A Comparative Analysis of Two Social Networking Sites ....................................................................66 Appendix C: The Antecedents of Viral Growth on Social Networking Platforms99 Appendix D: The Influence of User Mix on the Viral Growth of Social Networking Sites ......................................................................................175 References ........................................................................................................................225 v LIST OF TABLES Table 1: Unknowns Mapped to Research Questions ........................................................ 31 Table 2: Quality Criteria ................................................................................................... 58 Table 3: Model Comparison by Age ................................................................................. 64 Table B1: Sharing and Usage Distribution ....................................................................... 70 Table B2: Original and Selected Themes ......................................................................... 72 Table B3: Social Processes of Selves, Viral Equation, and p-values ............................... 90 Table C1: Demographics ................................................................................................ 126 Table C2: EFA & CFA Summary ................................................................................... 130 Table C3: Correlation Matrix.......................................................................................... 133 Table C4: Model Fit Statistics for Structural Analysis ................................................... 136 Table C5: Hypotheses Summary .................................................................................... 139 Table C6: Indirect Effects of Voyeurism and Exhibitionism on Fan Out and Retention ............................................................................................................. 143 Table C7: Summary of Model Differences ..................................................................... 144 Table C8: Model Comparison ......................................................................................... 145 Table C9: Control Effects ............................................................................................... 146 Table D1: Within User Voyeur to Exhibition Ratio ....................................................... 186 Table D2: Between Users Voyeur to Exhibition Ratio ................................................... 186 Table D3: Demographics ................................................................................................ 197 Table D4: Summary of Clustering Models for Within Users ......................................... 199 Table D5: Clustering for Voyeurism & Exhibitionism within Users ............................. 201 Table D6: Summary of Clustering Models for Exhibitionism between Users ............... 201 vi Table D7: Summary of Clustering Models for Voyeurism between Users .................... 201 Table D8: Clustering Between User ............................................................................... 202 Table D9: EFA & CFA Summary .................................................................................