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Instead of sub domain, email address would have been a better choice.

user@provider.tld

Where provider.tld provides specification/api.. like robot.txt/tent.json that would specify actual api endpoints for given user.

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I think both are unfortunate, since it ties your identity to your current provider. I'd much rather see a truly decoupled system, even if it didn't provide a "friendly" user id, but only an hidden fingerprint. People can just search for name and other data anyway.

This exists, The Discovery Protocol Stack http://hueniverse.com/2009/11/the-discovery-protocol-stack-r...

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