How Deeply Do You Focus the Lens?

I have another post brewing, basically the other shitkettle that's stinking up my life at the moment. It's even written. However, it's dark and deeply personal, and I'm still trying to figure out just how much one can/should let leak from behind the mask of their blogonymity.

So, dear apprentices, how do you balance connecting with your readers as more than a witting wordy pontiff and feeling exposed?

I'm aware that each of us must choose how much of our real lives to reveal. I intend to write more than mere Mad Science Lulz, but at the same time, do I want to invite you all to examine the light at the end of the tunnel between my ears? This is the question I am currently wrestling with, and perhaps your experienced wisdom/bidness could lend me a hand.