Abstract: Universal synchronization of profiles of audience members targeted for the delivery of content. A unique global identifier may be assigned to and used to manage a profiled audience member. This identifier may also be associated to an authoritative identifier and cookie information used in connection with the collection of profile data. An authoritative identifier may be received in connection with activity, and might not be accompanied by a global identifier. The authoritative identifier may then be used to identify the global identifier, which in turn may be used to identify the cookie related information of record for the profiled audience member. Comparing the cookie related information to previously retained cookie information may be used to determine that the cookie information for a particular, profiled audience member has changed, so that it can be restored.