You don't have to write personal / confidential stuff in an open blog. My 3 open blogs are all about stuff that interests me like writing, gaming, videos, Final Fantasy, etc... Not one of them has personal stuff. I leave al lthat in my secure blog for friends only.

Mainly my sister, which lives far away and we want to keep in touch with each other. When we e-mail each other or talk on the phone we are usually so caught up with day to day stuff that we forget to talk about deep personal stuff. My blog is a very fast way to have long rants, on the cheap, in a way that she reads it when she has the time, from any computer she is at (work, home). Same for me, I read her musings just clicking on a bookmark, instead of having to fish out an email in my spam flooded Inbox.