| 摘要 |
Systems, methods, and machine-readable media are disclosed for using past presence information to help determine a current presence of a user. In one embodiment, determining presence of a user on one or more devices or networks can comprise periodically querying a plurality of devices to determine a presence of the user on one or more of the plurality of devices. An indication of the presence of the user on the one or more of the plurality of devices can be received and presence information related to the indication of the presence of the user on the one or more devices can be stored. A request for a presence of the user can be received and, in response, the stored presence information can be retrieved. The stored presence information and, in some cases, current presence information can be provided in response to the request for the presence of the user.
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