14. A computer-implemented method for identifying social relationships for a first user operating in a first network controlled by a first entity, comprising presenting to the first user a plurality of contacts having a relationship with the first user, the plurality of contacts having been determined with reference to a first data source associated with the first network and under control of the first entity, at least one external data source outside of the first network and not under control of the first entity, and an identity of the first user, wherein each external data source employs a permissioning model for controlling access to information associated with the external data source, the identity having been determined with reference to the first data source and the at least one external data source, a first subset of the contacts not being identifiable from the first data source, wherein the plurality of contacts is presented in accordance with a relevancy measure associated with each of the contacts which represents a relevance of the relationship between the first user and the associated contact, the relevancy measure for each contact having been determined with reference to one or more of the first data source or the at least one external data source, wherein the at least one external data source are within one or more other networks, the method further comprising presenting to the first user aggregations of 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, the aggregations having been determined at least in part by accessing the information associated with the at least one external data source according to the corresponding permissioning model, wherein the first user is a member of the first network and the one or more other networks, thereby aggregating the permissioning models associated with 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.
14. A computer-implemented method for identifying social relationships for a first user operating in a first network controlled by a first entity, comprising presenting to the first user a plurality of contacts having a relationship with the first user, the plurality of contacts having been determined with reference to a first data source associated with the first network and under control of the first entity, at least one external data source outside of the first network and not under control of the first entity, and an identity of the first user, wherein each external data source employs a permissioning model for controlling access to information associated with the external data source, the identity having been determined with reference to the first data source and the at least one external data source, a first subset of the contacts not being identifiable from the first data source, wherein the plurality of contacts is presented in accordance with a relevancy measure associated with each of the contacts which represents a relevance of the relationship between the first user and the associated contact, the relevancy measure for each contact having been determined with reference to one or more of the first data source or the at least one external data source, wherein the at least one external data source are within one or more other networks, the method further comprising presenting to the first user aggregations of 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, the aggregations having been determined at least in part by accessing the information associated with the at least one external data source according to the corresponding permissioning model, wherein the first user is a member of the first network and the one or more other networks, thereby aggregating the permissioning models associated with 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. 24. The method of claim 14 wherein the vitality events include posting of content, actions taken, updating profiles, or a combination thereof.