So what kind of real social networking applications would Silverlight enable? Would it be network visualization or media playback or mash-ups? Google with its Orkut online community (a closed-source ASP.Net application) created an API for social applications so that developers can build applications that can then run inside other social networking applications. They then opened up the specification for that API to other social networking applications so that all other social networking sites can (if they want to) make their sites containers for third-party applications. So I started playing with it.