video presentation from Kevin Marks, Google's main evangelist for the OpenSocial project. Marks explains more about the theory behind OpenSocial, in what he calls "the social cloud". This seems to be a variation of the Social Graph concept, which Alex Iskold analyzed for ReadWriteWeb last September. See also Sarah Perez's post today on a new search engine called Delver, which "leverages the social graph to map out a user's social connections."Interesting
We're seeing more and more products that utilize the social graph, and so Marks' explanation is a useful primer on the concepts behind them.