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51 that charge a per-message fee, such as LinkedIn [95] and Goodmail [59]. In some of the proposed systems, the per-message fee is charged only if the receiver classifies the messages as unwanted. This feature is desirable because it preserves the ability of any legitimate content originator to reach a large audience at low cost. Otherwise, users who send a large amount of wanted communication are subject to prohibitively high fees, thereby reducing the usefulness of the communication medium. In general, one significant disadvantage of these proposals is that they typically require an extensive micropayment infrastructure, which some have claimed is im- practical [2,88,120]. Additionally, the cost could be in terms of a resource other than money [139]. However, it may be difficult to ensure that the resource is readily available to anyone in quantities sufficient for legitimate communication, but hard to acquire in quantities needed for unwanted communication at a large scale. Alternative systems impose a per-user quota on sending messages [156], limiting each user to sending only a certain number of messages per day. Systems based on quotas do not need micropayments but still require a market for the distribution of the user quotas. This market must ensure that legitimate senders can obtain a sufficient quota at reasonable cost, while the cost for spammers must be high enough to discourage large-scale unwanted communication.PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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