| http://www.w3.org/ns/prov#value | - In these embodiments, each time a user begins a new visit to the subject web site, the facility chooses an advertiser to sponsor that visit, by (a) identifying the audiences of which the user is a member; (b) identifying all of the bids specifying any of these audiences; (c) determining for each identified bid an expected value representing the anticipated level of advertising revenue that would b
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