Abstract: In one embodiment, a method includes receiving from a client system of a user, background signal-information identifying one or more first wireless signals within wireless communication range of the client system; accessing a place-entity database, wherein the place-entity database comprises information indicating that a first place-entity corresponds to one or more second wireless signals; determining that the client system is located at a geographic location associated with the first place-entity based on determining that the one or more first wireless signals match the one or more second wireless signals and further based on the information indicating that the first place-entity corresponds to the one or more second wireless signals; and sending, to the client system, information associated with the first place-entity automatically without a query from the user of the client system, wherein the query is related to the first place-entity.

Abstract: In one embodiment, a method includes receiving from a client system of a user, background signal-information identifying one or more first wireless signals within wireless communication range of the client system; accessing a place-entity database, wherein the place-entity database comprises information indicating that a first place-entity corresponds to one or more second wireless signals; determining that the client system is located at a geographic location associated with the first place-entity based on determining that the one or more first wireless signals match the one or more second wireless signals and further based on the information indicating that the first place-entity corresponds to the one or more second wireless signals; and sending, to the client system, information associated with the first place-entity automatically without a query from the user of the client system, wherein the query is related to the first place-entity.

Abstract: In one embodiment, a method includes receiving, from a first software application of a client system associated with a user of an online social network, background signal-information identifying one or more first wireless signals; storing the signal-information and a client identifier for the client system in a signal-information database; receiving, from a second software application of the client system via a places-API of the online social network, a places-API call indicating that the client system is located at a geographic location corresponding to a first place-entity; recording the places-API call in an API-call log, wherein the API-call log records the first place-entity and the client identifier; determining a correlation between the signal-information and the first place-entity; and updating a place-entity database to indicate that the first place-entity corresponds to the one or more first wireless signals identified by the signal-information.