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152 nication. If the sender has previously sent too much unwanted communication, Ostra refuses to issue such a token and rejects the communication. Transmission Ostra attaches the token to the communication and transmits it using the existing communication mechanism. On the receiving side, Ostra accepts the communication if the token is valid. The communication is then provided to the recipient. Note that Ostra is not involved in the actual transmission of the communication. Classification The recipient classifies the communication as either wanted or unwanted, according to her personal preferences. This feedback is then provided to Ostra. Finally, Ostra makes this feedback available to the sender. Note that in message-based communication systems, Ostra would normally be needed only for communication among users who do not regularly communicate with each other. Therefore, as an optimization, it is assumed that users maintain a whitelist of other users from whom they are willing to accept communication with- out endorsement from Ostra. For convenience, this whitelist could be automatically derived from the list of a user’s direct friends in the social network.PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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