If I update my LJ, there will be a notice on Facebook, but nothing on Twitter.
If I tweet, there will be a notice on Facebook, but nothing on LJ.
If I update Facebook normally, it will only appear on Facebook, BUT...
If I update LiveJournal via BlogIt (which is from SixApart, interestingly enough) on Facebook, it will appear on LJ, Facebook, and Twitter, BUT I can't automatically add tags or use any userpic other than the default (although I could go back and edit those manually on LJ).
It'll be interesting to see how whatever CMS/blogging software I set up on www.gneech.com plays into all this. Thanks for your patience, all!