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150 the need for strong identities, because such identities are difficult to obtain in practice. 8.1.1 Assumptions The strawman design is based on three assumptions. 1. Each user of the communication system has exactly one unique digital identity. 2. A trusted entity observes all user actions and associates them with the identity of the user performing the action. 3. Users classify communication they receive as wanted (relevant) or unwanted (irrelevant). Assumption 1 would require a user background check (e.g., a credit check) as part of the account creation process, to ensure that a user cannot easily create multiple iden- tities; this assumption will be relaxed in Section 8.2. Assumption 2 holds whenever a service is hosted by a trusted Web site or controlled by a trusted tracker compo- nent; the trusted component requires users to log in and associates all actions with a user. We sketch a decentralized design that does not depend on this assumption in Section 8.5. Producing communication can mean sending a email or chat message; adding an entry or comment to a blog; sending an invitation in an IM, VoIP, or social networking system; or contributing content in a content-sharing site. Receiving communication can mean receiving a message or viewing a blog entry, comment, or search result.PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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