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Cloudworks is a social networking site for learning design, adopting a web 2.0-based philosophy and is intended as an evolving, dynamic community of tools, resources and users associated with learning design. The site is based on the notion of social objects, which Engeström (2005) defines as:

The term 'social networking' makes little sense if we leave out the objects that mediate the ties between people. Think about the object as the reason why people affiliate with each specific other and not just anyone… The fallacy is to think that social networks are just made up of people. They're not; social networks consist of people who are connected by a shared object.

http://e4innovation.com/?tag=CLouDworks

Source: George Siemens at http://connectivism.ca/blog/2008/03/i_mean_really_where_did_we_thi.html

A comment: I think this diagram is elaborating the the more general model above, applied to educational settings.