Now that I'm on Facebook, I've mostly stopped posting on LJ. With LJ, I feel like I need to have something important to say, which I usually don't. Twitter's inane one-liners and jarring, disjointed reply-to tweets were just annoying. Facebook strikes the perfect blend of promoting unobtrusive, minimal conversations/pics/links/whatever that are kept in a logical order.
So many more friends use Facebook over LJ as well, so I'm pretty much abandoning ship and just reading/commenting on LJ from now on. Look me up on Facebook if you want:
http://www.facebook.com/mikeycooper