2015-07-13 UTC
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tantek KevinMarks - that Flickr diagram by Chris led me down a rabbithole to this 2010 SWAT0 discussion in an email list (google group), where benwerd is prominent: https://groups.google.com/forum/#!msg/federated-social-web/zXamWQCbHI4/mFFyabdv3IsJ