I have a Gmail account and wanted to create a blog. I decided to get rid of any other blogs (i.e. Live Journal) that I had at the time and just focus on developing one.
I created a blog because I felt that I wanted to write and I missed writing. Despite being a pretty open book for some reason I felt more comfortable sharing personal things with strangers than with friends and/or family. Now I have no problem with strangers or people I know reading my blog.
Sometimes I get stuck with what to write so if I think of blog topics I just put them into my "blog" word document until I feel like writing them.