Combating Attacks and Abuse in Large Online Communities
University of California Santa Barbara Combating Attacks and Abuse in Large Online Communities Adissertationsubmittedinpartialsatisfaction of the requirements for the degree Doctor of Philosophy in Computer Science by Gang Wang Committee in charge: Professor Ben Y. Zhao, Chair Professor Haitao Zheng Professor Christopher Kruegel September 2016 The Dissertation of Gang Wang is approved. Professor Christopher Kruegel Professor Haitao Zheng Professor Ben Y. Zhao, Committee Chair July 2016 Combating Attacks and Abuse in Large Online Communities Copyright c 2016 ⃝ by Gang Wang iii Acknowledgements I would like to thank my advisors Ben Y.Zhao and Haitao Zheng formentoringmethrough- out the PhD program. They were always there for me, giving me timely and helpful advice in almost all aspects of both research and life. I also want to thank my PhD committee member Christopher Kruegel for his guidance in my research projects and job hunting. Finally, I want to thank my mentors in previous internships: Jay Stokes, Cormac Herley, Weidong Cui and Helen Wang from Microsoft Research, and Vicente Silveira fromLinkedIn.Specialthanksto Janet Kayfetz, who has helped me greatly with my writing and presentation skills. Iamverymuchthankfultomycollaboratorsfortheirhardwork, without which none of this research would have been possible. First and foremost, to the members of SAND Lab at UC Santa Barbara: Christo Wilson, Bolun Wang, Tianyi Wang, Manish Mohanlal, Xiaohan Zhao, Zengbin Zhang, Xia Zhou, Ana Nika, Xinyi Zhang, Shiliang Tang, Alessandra Sala, Yibo Zhu, Lin Zhou, Weile Zhang, Konark Gill, Divya Sambasivan, Xiaoxiao Yu, Troy Stein- bauer, Tristan Konolige, Yu Su and Yuanyang Zhang. Second, totheemployeesatMicrosoft: Jack Stokes, Cormac Herley and David Felstead. Third, to Miriam Metzger from the Depart- ment of Communications at UC Santa Barbara, and Sarita Y.
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