| 摘要 |
A system for presenting advertising materials including group sales offers within the context of a network-accessible document such as a Web page. One embodiment stores a plurality of ads, including some group sales offers. Fulfillment of each group sales offer is conditioned upon acceptance of the offer by a prescribed minimum number of viewers. The system receives a request for online content from a client computer operated by a viewer, where the requested online content is unrelated to group sales offers. Responsive to the request, the system selects a group sales offer from the plurality of ads based on the nature of the requested content and/or viewer characteristics or past behavior accumulated from past communications with the viewer. The system automatically delivers the selected group sales offer and the requested content to the client computer for display.
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