Random question that came to mind.
Do you ever edit your LiveJournal entries?
Never. Once it's on the web, it's published. How would you like it if a book you were reading changed while you were holding it?
No. It's just a journal; what's the point?
Only for typos, which I usually catch right away, if at all.
Sometimes, but I always indicate which part of an edited entry was added later.
I have no qualms about editing a 3-year-old entry for clarity, if I happen to notice it. I edit more often than you would ever realize.