TechCrunch blogger Michael Arrington says Facebook is on the verge of making its Facebook Platform an open source project. Arrington expects it to model the Google-backed Open Social, which means it will enable other social networking sites to become "Facebook Platform compatible" and allow application Facebook app developers to run those apps on the other sites.
Currently, networking site Bebo licenses the platform, but other sites will not have to strike such deals once the platform is open sourced. Says Arrington:
They'll simply map their existing APIs to Facebook Platform (which isn't trivial) and go... [T]hird parties will be free to change the Facebook Platform components for their own use and deploy them on their own sites. To have those changes incorporated into the official versions of Facebook Platform, however, would require Facebook's approval.
He likens Facebook to "a walled garden" and says it's time for Mark Zuckerberg's brainchild to rise to the level of its competition and fight back.