Why Blog?

I think to myself do I really need to have a blog? I do like sitting at the computer more than writing in a notebook. But if I shared real feelings and thoughts I'm sure I would not want people to read it. So I find myself wondering will this just be another way to share what my kids are doing, and how big they are growing, or will I share some hardcore thoughts with random strangers. I could write when I can't sleep, or it might keep me from sleeping. I could write when I'm upset, or stressed, but would I write what I feel or would I write what someone who is reading this would want to hear. Would I go back and reflect on them, or will I just babble in hopes to entertain someone. I guess a blog eventually creates it's own purpose, I hope to keep honest, and sincere while creating this. I hope it creates it's own purpose, for me.