For awhile we've been pushing the idea of Facebook evolving to support business social networking alongside the "social" social networking. But in order for that to work, the site needs to find a way to shed its image as a beacon of college hooliganism -- Facebook is a place to post party pictures, not product pitches. But even so, the appeal of leveraging Facebook's social graph for business is too good to pass up. As we've noted in the past, there are already huge business networks on...