| 摘要 |
Described is a technology by which by which information (an electronic note from a producer) that is available for delivery to a client consumer is only selectively delivered. The selective delivery may be based on metadata associated with the information, client identity data and other criteria, including a location of a client device. The information to selectively deliver may be obtained from an external information source, or generated by a service, such as when the user is near a location of interest. The client may report location changes, such as a rate corresponding to a rate of location change of the client. An information service scale to any practical number of clients via client state servers and location (of interest) servers, with each client state server associated with a set of one or more clients, and each location server associated with a set of one or more regions.
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