As Arin points out, there *are* a few folks who can Twitter effectively, but man... The rest is noise. As for Facebook, I would only consider using it for some specific project. I signed on for about ten minutes two years ago and the people I came across were either already friends on LJ or they were exactly the sort of high school acquaintances I expected to find on Facebook... you know, the ones that made me glad that high school was over.