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8.1.6 Multi-party communication Next, we show how the design can be used to support moderated multi-party com- munication, including mailing lists and content-sharing sites. The existing design generalizes naturally to small groups in which all members know each other. In this case, communication occurs as a series of pairwise events between the originator and each of the remaining group members. In moderated groups, which are usually larger, a moderator decides on behalf of the list members if communication submitted to the group is appropriate. In this case, Ostra works exactly as in the two-party case, except that the moderator receives and classifies the communication on behalf of all members of the group. Thus, only the moderator’s attention is wasted by unwanted communication, and the cost of producing unwanted communication is the same as in the two-party case. However, an overloaded moderator may choose to increase the number of credits required to send to the group, to mitigate her load by discouraging inappropriate submissions. Large content-sharing sites usually have content-rating systems or other methods for flagging content as inappropriate. Ostra could be applied, for instance, to thwart the submission of mislabeled videos in YouTube, by taking advantage of the existing “flag as inappropriate” mechanism. When a user’s video is flagged as inappropriate, it is reviewed by a YouTube employee; if it is found to be mislabeled, the submission is classified as unwanted for the purposes of Ostra. 160PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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