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Not a bad idea. We can make the categories and albums public but the images member only but I'm all for keeping things open generally. Getting people to sign up doesn't seem to be an issue as there's a constant stream of members it's the engagement that is sometimes tricky. The advantage of Facebook is it's general social aim but it's also the big disadvantage in that pretty much everything posted there is ultimately doomed to get lost. We're working on allowing people to post before registering so that posting and signing up are part of the same process. Hopefully that will help.