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Figure 8.1 : Diagram of (a) the original communication system S, and (b) the com- munication system with Ostra. The three phases of Ostra — (1) authorization, (2) transmission, and (3) classification — are shown. Typically, a user considers communication unwanted if she feels the content was not worth the attention. A user considers a blog entry, comment, or content object as unwanted if she considers the object to be inappropriate for the venue (e.g., site, group, or blog space) it was placed in or to have inappropriate search tags, causing the object to appear in response to an unrelated search. 8.1.2 System model Figure 8.1 shows how Ostra interacts with a given communication system S. Ostra is a separate module that runs alongside the existing communication system. With Ostra, communication consists of three phases. Authorization When a sender wishes to produce a communication, she first passes the communica- tion to Ostra. Ostra then issues a token specific to the sender, recipient, and commu- 151PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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