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- Studying social network sites with the combination of traditional social science and computational approachesPublication . Spiliotopoulos, Anastasios; Oakley, Ian; Campos, PedroSocial Network Sites (SNSs) are fundamentally changing the way humans connect, communicate and relate to one another and have attracted a considerable amount of research attention. In general, two distinct research approaches have been followed in the pursuit of results in this research area. First, established traditional social science methods, such as surveys and interviews, have been extensively used for inquiry-based research on SNSs. More recently, however, the advent of Application Programming Interfaces (APIs) has enabled data-centric approaches that have culminated in theory-free “big data” studies. Both of these approaches have advantages, disadvantages and limitations that need to be considered in SNS studies. The objective of this dissertation is to demonstrate how a suitable combination of these two approaches can lead to a better understanding of user behavior on SNSs and can enhance the design of such systems. To this end, I present two two-part studies that act as four pieces of evidence in support of this objective. In particular, these studies investigate whether a combination of survey and API-collected data can provide additional value and insights when a) predicting Facebook motivations, b) understanding social media selection, c) understanding patterns of communication on Facebook, and d) predicting and modeling tie strength, compared to what can be gained by following a traditional social science or a computational approach in isolation. I then discuss how the findings from these studies contribute to our understanding of online behavior both at the individual user level, e.g. how people navigate the SNS ecosystem, and at the level of dyadic relationships, e.g. how tie strength and interpersonal trust affect patterns of dyadic communication. Furthermore, I describe specific implications for SNS designers and researchers that arise from this work. For example, the work presented has theoretical implications for the Uses and Gratifications (U&G) framework and for the application of Rational Choice Theory (RCT) in the context of SNS interactions, and design implications such as enhancing SNS users’ privacy and convenience by supporting reciprocity of interactions. I also explain how the results of the conducted studies demonstrate the added value of combining traditional social science and computational methods for the study of SNSs, and, finally, I provide reflections on the strengths and limitations of the overall research approach that can be of use to similar research efforts.