Most people commenting in this thread are missing the point. This is about giving you the ability to put your personal data on a server that you control first,

Most people commenting in this thread are missing the point. This is about giving you the ability to put your personal data on a server that you control first, and then having the ability to push it to cloud services you don't control (like Facebook, Twitter, Google apps) easily and selectively through those services' APIs. That way, from your perspective, all the "clouds" revolve around your personal server and they are all interchangeable and disposable to you, because you have all the data on your box and can just choose to push it somewhere else instead. It means you can use all the cloud services, but are no longer dependent on any one of them for storing your own data.