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Yahoo has joined Google’s silo building by releasing BBAuth, a mechanism for other sites to access services and data within the world of Yahoo.

Unlike Google’s Account Authentication, Yahoo is allowing their service to be used for SSO and registration.

BBAuth is clearly targeted at Web 2.0 site developers, encouraging them to build apps on the Yahoo platform so that they get access to all those Yahoo users.. While I understand how this helps Yahoo strengthen their relationship with their users, it would seem Yahoo did not learn what Microsoft learned with Passport, as Yahoo is deepening their identity silo, rather then participating in the emerging identity infrastructure.