E. Koutrouli
G. Kanellopoulos
A. Tsalgatidou
ABSTRACT
Online social networks have changed the way people communicate, create content and share it via online social actions. In order for users to engage in a social network application, they need mechanisms that will help them to find other users that they can trust in some context and also qualitative and useful content. Reputation systems offer such mechanisms and are thus essential in Social Networks (SNs). Due to their open and social nature and to their different objectives, reputation systems for SN-based applications comprise of various different mechanisms which fulfill the different objectives in the specific application context. There is thus the need for a systematic study of the specific aspects of these systems, which can provide insights for the design of reputation systems in specific application contexts. In our paper we present a taxonomy of reputation systems for various SN applications based on their specific aspects. We then use this taxonomy to design a reputation system for microblogging systems and present our implementation for a reputation system for Twitter which estimates a specific notion of reputation; the influence of users and of specific subjects of discussion.
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