Outside of FAA I'm thinking of posting my images only to Flickr and now the LinkedIn products, especially the publishing platform which is working now more like a blog ... and I have a built-in audience with all of my LinkedIn connections. Because both of these platforms come out and say they respect your content and Copyrights, and will only use your original content when they ask permission to do so. Even WordPress is going in the direction towards Creative Commons, which is a great licensing method for almost all media types except photography.
By the way, I want to link to this discussion a thread of mine which is an 'everything LinkedIn' of sorts: http://pixels.com/showmessages.php?messageid=1629365 ( If you're on FAA then replace in that link "pixels" with "fineartamerica" ).