Decentralization Is Key
What makes OpenID so intriguing is the fact that it offers a standard that is fully decentralized from the providers and consumers. This aspect is what allows a single consuming site to allow its users to log in via Yahoo! and Google, while another site may want to allow logins via Blogger or WordPress. Ultimately, it is up to the OpenID consumer (your site or service) to choose what login methods it would like to offer its user base.
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