An identities collaboration system that comprises a Personal Service Provider (PSP) system for supplying specific user related personal service(s); means for assigning two different data files to each user opting-in to the PSP system, wherein one data file contains data representing the user identity at the PSP system and it assigned on a first domain, and the other data file(s) contains data representing the information regarding whether the user is opted-in, or another identity number that is related to the user identity at the PSP, and is assigned on a second domain. The data files are stored within the terminal of each of the opting-in users; The system also comprises a third party server for providing personal service or tailored content to the opting-in user; and a utilities package, located within each of the third party servers, for identifying or re-tagging the user as a PSP user by using the data files, whenever such data file exists, or existed in the past, and is currently missing from the terminal of the user.
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