My LJ posts tend to be be f-locked, as I'd rather the wider world wasn't aware of my social habits, holiday plans, etc. Series such as "Retro SF Image of the Day" are public, of course.

My FB posts are more general. I sometimes mention social events, but only in very loose terms and always after they've occurred.

I set up a DW account, just to grab the username, but have never used it.

I have a Blogger account, which includes a number of film and book reviews; it's where I point folks who might offer me freelance work.

I've never used Twitter, and almost certainly never will.