I think Google could make a FB killer by releasing an open source app engine app that allowed users to exchange notifications with their friends. Users could us

I think Google could make a FB killer by releasing an open source app engine app that allowed users to exchange notifications with their friends. Users could use Google's version or host their own modified version. Communication would take place between app instances via an open api implemented by each app. The advantage of this would be that non-technical users would have a very FB-like experience, while more technical users could modify the app to suit their own preferences, and then share the app source with others. The important thing would be to keep a standard api so that the different app versions could communicate.