So what does this mean? Well in short in allows anybody to develop applications for the social networking service using OpenSocial APIs. If you would like to start developing social apps, build social platforms or allow your user to take their profiles with them anywhere on the web then you should check opensocial.org. Here you can find all the information you need to get started with your next project and also a list of the social networks that use opensocial.
If you have some time and fancy yourself as a social apps developer you could always try your hand at it and be in the running for $5000.Go here http://blog.opensocial.org/2009/09/write-gadget-win-5000.html to find out more