An official blogger

I am joining the crowd. I am posting online. But what I have not decided is whether this blog is going to be display of my emotional state of mind or a place where I post my random thoughts about anything. As tempting as it is to be an emotional slut, I am also wary of the consequences I will have putting myself out there for all to see. So why are people writing blogs? Why am I starting this? I have no clear idea yet.