According to Chris Messina  (and I agree):

OpenID, by design, favors the user rather than the relying party. In contrast, technologies like Facebook and Twitter Connect emphasize the benefits to relying parties. So while it might seem like an inconvenience to custom-tailor your personal privacy settings on Facebook, the liberal defaults are meant to make Facebook users’ accounts more valuable to relying parties than other, more privacy-preserving account configurations.

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