| 摘要 |
A computer-implemented method and display advertising server network for serving impression opportunities to a frequency-capped guaranteed delivery contract in a system for delivery of display advertising to a user. The method includes steps for receiving, from a computer, an event predicate and a user ID corresponding to the user, retrieving, from an index engine, a set of eligible frequency-capped contracts, wherein an eligible contract comprises at least one target predicate matching at least a portion of the event predicate, and probabilistically selecting for serving, in a computer, the booked contract having a frequency cap specification, only when the selected frequency-capped contract can be served to the user without violating the frequency cap specification. Exemplary embodiments include generating a pseudo-random number sequence, and then selecting a particular pseudo-random number from the series of pseudo-random numbers, the selected particular pseudo-random number being based on the user ID, a visit count, a URL.
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