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No write API means that literally everything I read on G+ was typed by a human. I really, really like that.

Facebook and Twitter have become part of the fabric of the web because if their open APIs, which have greatly helped their widespread adoption. There are many non-write use cases, for example auth. Seen "Sign-in via Google+" implemented anywhere?

Yup. In fact, I've implemented it. :)

Care to share?

Sure - http://mashable.com/login/

Implementation docs are at https://developers.google.com/accounts/docs/OAuth2

Nice! Thanks for sharing (sorry, don't read Mashable so missed this).

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