Ning - a meta social app platform ""So after being offered a large number of social media applications, we are now into the meta-framework to build social media applications. The notion is interesting: as we have come to expect that any consumer application will include some element of social networking, collaborative filtering, tagging, etc., Ning has the first shot at claiming platform status in the social phenomena by offering building consistent building blocks (though wikis could probably claim anteriority)."...What it does do is make APIs an even more important feature for social apps to have, because Ning users will potentially have less need to visit the websites of Flickr, del.icio.us, 43Things and others. Ning will drive customers to those other services, but via the APIs. "
I always seem to quote people who quote other people, seems apt in this case.