1. A computer-implemented method for identifying social relationships for a first user operating in a first network controlled by a first entity, comprising: ascertaining an identity of the first user with reference to a first data source associated with the first network and under control of the first entity, and at least one external data source outside of the first network and not under control of the first entity, wherein the at least one external data source are within one or more other networks, wherein each external data source employs a permissioning model for controlling access to information associated with the external data source; accessing the information associated with the at least one external data source according to the corresponding permissioning model, thereby aggregating the permissioning models associated with the external data sources; identifying a plurality of contacts having a relationship with the first user with reference to the first data source, the at least one external data source, and the identity of the first user, a first subset of the contacts not being identifiable from the first data source; aggregating vitality events from inside multiple social networks for particular ones of the plurality of contacts, the multiple social networks including the first network and the one or more other networks, wherein aggregating vitality events includes aggregating the vitality events from inside the first network and inside the one or more other networks for the particular ones of the plurality of contacts, wherein the first user is a member of the first network and the one or more other networks, thereby aggregating the vitality events for the particular ones of the plurality of contacts across the multiple social networks; wherein the vitality events indicate the nature and/or content of online activities inside the first network and the one or more other networks for the particular ones of the plurality of contacts.
1. A computer-implemented method for identifying social relationships for a first user operating in a first network controlled by a first entity, comprising: ascertaining an identity of the first user with reference to a first data source associated with the first network and under control of the first entity, and at least one external data source outside of the first network and not under control of the first entity, wherein the at least one external data source are within one or more other networks, wherein each external data source employs a permissioning model for controlling access to information associated with the external data source; accessing the information associated with the at least one external data source according to the corresponding permissioning model, thereby aggregating the permissioning models associated with the external data sources; identifying a plurality of contacts having a relationship with the first user with reference to the first data source, the at least one external data source, and the identity of the first user, a first subset of the contacts not being identifiable from the first data source; aggregating vitality events from inside multiple social networks for particular ones of the plurality of contacts, the multiple social networks including the first network and the one or more other networks, wherein aggregating vitality events includes aggregating the vitality events from inside the first network and inside the one or more other networks for the particular ones of the plurality of contacts, wherein the first user is a member of the first network and the one or more other networks, thereby aggregating the vitality events for the particular ones of the plurality of contacts across the multiple social networks; wherein the vitality events indicate the nature and/or content of online activities inside the first network and the one or more other networks for the particular ones of the plurality of contacts. 30. The method of claim 1 , further comprising: identifying at least one of relationships or interactions in the first network; identifying at least one of relationships or interactions in a second network, the second network being one of the other networks; determining that an identity of an individual in one of the relationships or interactions in the second network corresponds to the same individual in one of the relationships or interactions in the first network; and aggregating the vitality events for the individual across the second network and the first network.