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You have the option of keeping your posts public, and anyone can leave a comment on a public post, even if they do not have an account.  A lot (almost certainly a large majority) of LJ members do use it as more of a journal and make most or all of their entries friends-only or private, but there are still people who LJ the way one might use Blogger or Blogspot.  Services like Blogspot are newer, so more people tend to use those for public blogs today, but I've seen websites that have used public LJs as site blogs.  LJ is very similar to these other blog services, it's just that the culture of it has become more personal than public.  But you can still use LJ as a public blog if you wish.