Communicating with Ning developers members

I signed up to get access to the application developer sandbox with OpenSocial v0.7 The purpose of this social network is to enable developers to implement and test the OpenSocial Application with Ning. However Ning points out those editorially-selected applications will be featured as part of their new directory. This made me feel concerned about the privacy of our application as we do not want it to be viewed by the public.

I sent a query to Ning to enquire what is the appropriate type of OpenSocial Application to be developed: (e.g. Profile based OpenSocial Applications or Network Wide OpenSocial Applications) taking into account the privacy and security demands.