OpenSocial API
Looks like I am writing only about Google but it is just because they produce pretty interesting stuff. This time Google created a new API which will help you to create apps which can run on any social network which uses this API. Sounds like Facebook? The API will consist of three groups: People, Storage and Activities. So, watch tomorrow http://code.google.com/apis/opensocial (documentation) and http://sandbox.orkut.com (sandbox).
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