Patent ID: 8719289

Claim:
A method comprising: detecting an addition of an identifier to a contact list, wherein the identifier identifies an entity in a first collaboration system; searching data to find a different identifier that identifies the entity in at least a second collaboration system, wherein the searching of data comprises searching an index of user identifiers that includes a group of user identifiers, wherein the group of user identifiers includes a plurality of identifiers identifying the entity, wherein said plurality of identifiers comprise the identifier of the first collaboration system and the different identifier of the second collaboration system; providing within a user interface a user selectable option to add the one or more identifiers to the contact list; receiving, responsive to presenting the different identifier, user input that indicates the different identifier is to be added to the contact list, wherein the adding of the different identifier occurs responsive to and contingent upon receiving the user input; and adding to the contact list of the first collaboration system the different identifier found by searching the second collaboration system, wherein the different identifier is not present in the contact list before the adding, wherein the user selectable option permits the user to select a specific subset of the plurality of identifiers, wherein the user selection is for a subset of the plurality of identifiers, wherein said subset comprises more than one and less than the total number of identifiers of the plurality, wherein the adding of the at least one of the identifiers adds said subset of the identifiers to the contact list, wherein the detecting, searching, providing, receiving, and adding are performed by one or more processors executing program instructions stored on one or more non-transitory storage mediums.