henningz pointed something out to me:FAQ #25 says:
If you want to keep your journal secure from someone who has found your username, see "Can I make my whole journal Friends-Only or Private?" (http://www.livejournal.com/support/faqbrowse.bml?faqid=120) for information on setting the security level of all your past posts.In other words, if you want to set all your entries private or friends-only, you're redirected to another FAQ only to find "No, you can't".
While we're at it, I would also like to point out that the superfluous spaces around URLs in parentheses are not necessary to make the URL clickable; they only make things uglier :)