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47 on the majority of members of multiple Facebook networks, and do not require users to install any applications. 3.4 Preventing unwanted communication Later in this thesis, we present Ostra, a system that leverages the difficulty in estab- lishing and maintaining relationships in social networks to prevent malicious users from sending unwanted communication. Thus, we now describe related approaches, encompassing work that aims to prevent unwanted communication and work that leverages relationships in online social networks for other purposes. Unwanted communication has long been a problem in the form of email spam, and many strategies have been proposed to deal with it. However, the problem increas- ingly afflicts other communication media such as IM, VoIP, and social networking and content-sharing sites. At a high level, there are three approaches for preventing unwanted communication in unicast systems. First, one can examine the content of the communication itself, looking for messages that are likely to be unwanted. Sec- ond, one can look at the reputation of the sender, focusing on users who send lots of unwanted communication. Third, one can impose a cost on the sender, with the hope that this cost will discourage the sending of unwanted messages. Additionally, in systems that allow multiple recipients, one can also look at allowing recipients to vote on whether content is wanted or not. These four approaches are discussed in detail below.PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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