Personally I prefer LJ because I find it difficult to have conversations on tumblr - it's more reactory and hoping the person you're trying to converse with then sees your reblog :/ But tumblr has lots of pretty pictures!

We could do something like make a banner based on already posted fics type of thing? I think if you'rre looking at a celebration with fic and other shinies...that sounds like a big bang or a mini bang to me, where artists, writers, and creators team up, or a reverse big bang or mini bang where the art comes first rather than the fic. What's your thinking here?