Well, but on the other hand those ways don't always give as much opportunity for true discussion, which is what a lot of people - myself included - miss. Tumblr is great for sharing stuff, for instance, but there's little discussion that comes of it. At the same time, I haven't seen a lot of discussion on LJ either - just, as you said, collaboration. Which has to have a place, that's the whole point of fanart and fanfiction, but at the same time there's no way to discuss writing Amy Pond in a fanfic or what Jayne Cobb's true motivations were. That's the kind of thing I'm talking about, you know?