As far as I know - one can setup a Ning site in a way - that doesnt allow to Add Applications. But I found networks - that do allow to Add Application - but then it still doesnt work. May be this could be corrected?
Sample here: http://sharepoint.ning.com/opensocial/application/show?appUrl=http%3A%2F%2Fpreview.doxtop.com%2Fopensocial%2FdoXtop.xml&owner=3ojehil4n2b2b
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I think that you would be a good friend to have.
Sample here: http://sharepoint.ning.com/opensocial/application/show?appUrl=http%3A%2F%2Fpreview.doxtop.com%2Fopensocial%2FdoXtop.xml&owner=3ojehil4n2b2b