Distributed social network protocols
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General Resources
http://en.wikipedia.org/wiki/Distributed_social_network
http://www.w3.org/DesignIssues/CloudStorage.html
Protocols/Schemas/Projects
Salmon
http://www.salmon-protocol.org/
Webfinger
http://code.google.com/p/webfinger/
Activity Stream
Describes the content produced by one or multiple users as a flow of activity objects. The complete data set of the social net is described as one stream of things like: “Alice posted lalala, Bob liked Alices post, …” The language covers a wide variety of things that can happen on social networks, like comments, events, locations, ratings, mood, …
specification of activity objects is available for json and atom-feeds
Pubsubhubbub
https://code.google.com/p/pubsubhubbub/