Tal y como comenta Jeremy Zawodny, Yahoo! ha lanzado su servicio para desarrolladores BBAuth, un sistema de identificación de usuarios a través de Yahoo!.

You build great web applications. We have millions of users who store their data on Yahoo!. Browser-Based Authentication (BBAuth) makes it possible for your applications to use that data (with their permission).

BBAuth also offers a Single Sign-On (SSO) facility so that existing Yahoo! users can use your services without having to complete yet another registration process.