1. A method of managing an identity graph repository web service on a repository server computer, said method comprising: collecting a first identity graph of a first internet user, said first identity graph comprising a plurality of first user internet identifiers of said first internet user, each of said first user internet identifiers comprising a URL used by said first internet user in accessing a web service or application; collecting a second identity graph of a second internet user, said second identity graph comprising a plurality of second user internet identifiers of said second internet user, each of said second internet identifiers comprising a URL used by said second internet user in accessing a web service or application; storing said first and second identity graphs in a repository electronic memory associated with said repository server computer; and responsive to a request from a client computer, communicating one of said identity graphs to said client computer and displaying it on said client computer; wherein said collecting comprises: providing on a client computer an identity web page that displays at least a portion of a URL for each of a plurality of web services or applications; receiving on said client computer one or more internet identifiers used by said first internet user and associating each of said identifiers with one of said URL portions to create a plurality of possible URLs of said single internet user, each said possible URL a URL for one of said plurality of web services or applications; checking whether said plurality of possible URLS are active or inactive on the respective web services or applications; and providing an indication on said identity web page of said activity or inactivity, to form said identity graph providing a record of the use of said first internet user's internet identifiers on said plurality of web services or applications; and wherein said one or more user identifiers comprises a user identifier that a first user desires to register on a selected plurality of said web services and applications, and said method further comprises registering said user identifier on said selected plurality of said web services and applications on which it is indicated to not be active.