I can't really see doing that for myself - I have almost all my fic posted in at least three places, so if something of mine ends up disappearing from the web it'll be because I took it down, and I can't anticipate my reasons for that now. Still, it is something to consider and a useful thing to put on profiles. A lot of people leave theirs blank even on LJ or Dreamwidth or just put up some quote or joke, and I don't get that.