Marc's PeopleAggregator project is a good start in this direction. The problem described in this posting on Many2Many is exactly what federated identity networks (and supporting protocols) have been designed to address. Our identities (online and off) are fragmented all over the place, often purposefully, but we can regain control using federated identity protocols, both for easing our "single-sign-on" burden, but more importantly, to enable the sharing of these fragments between domains and sites.
3:56:23 PM 
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