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50 blacklisting requires strong user identities, as malicious users could otherwise trivially change identities. However, to date, no such large-scale strong identity system has been deployed, and the political, legal, and social issues associated with such a system make deployment in the near future unlikely. 3.4.3 Imposing a cost on the sender A third approach taken to discourage unwanted communication is imposing a cost on the originators of either all communication or unwanted communication. The cost can be monetary or in terms of another limited resource. Optionally, systems can impose a cost only on the senders of unwanted communications, instead of imposing a cost on senders of both wanted and unwanted communication. We discuss some specific proposals below. Quotas and micropayments Quota- and payment-based approaches attempt to change the economics of unwanted communication by imposing a marginal cost on the transmission of an (unwanted) message. Systems have been proposed where senders must commit to paying a per-message fee prior to sending digital communication [50,138], and, occasionally, one-time fees imposed by a trusted organization [59]. These solutions attempt to model the offline postal service; they are based on the assumption that the cost will discourage mass distribution of unwanted messages. There are a few examples of deployed systemsPDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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