OpenSocial details leaking out

The New York Times and TechCrunch both reported more details today on the OpenSocial set of APIs that will unify All Social Networks (except Facebook and MySpace).  What's especially interesting is the list of SNSs that have signed on.   In addition to the usual suspects (Orkut, LinkedIn, hi5, Friendster, Plaxo, Ning) the alliance includes Oracle and Salesforce.com.  While as a developer I look forward to leveraging all these sites through one convenient API I do wonder how Open Social will deal with the varying policies of the member sites.  For instance, LinkedIn has said they will require applications and/or developers to be certified before admitting them to the system.  How will these differences, and the different underlying features be exposed to the end users?