Blogs are public. So unless you want others prying into your
life, don't include anything personal.
I've got a public blog which I only use to keep in touch with my
friends and let them know how's things for me, so they don't always
have to ask me how's life and stuff. I don't blog 'bout anything
serious in this blog. I crap most of the times instead.
I also have a private anonymous blog that is password protected and
no one even has the URL so it's highly unlikely people who chance
upon it would know that I'm the blogger. That's where I blog 'bout
my private thoughts and sensitive issues.