Blogging rules?

Okay, so I've been going over this in my head for a while now...

What necessarily are the rules for blogging?  I mean-sure I know spill your thoughts out in some form of prose for the world to see via the internet, something similar to an online diary or journal...but what I'm asking about is the writing/content rules.  Are there any stipulations as to what you should talk about in your blog?

Now, understanding that it is just a blog, and in its simplicity is also the complexity that inspired the initial question.  I mean-people can very much so write about whatever they want.  They can post simple things like instructions, to stories, to jokes and anything else that you can think of.  But for me...well...I was wondering exactly where to draw the line.

I know that with this being the internet, just about anyone knowing that this blog exists can read it.  That's the whole point-give people something to read.  So when I write I can't help but to think about how personal I do/don't want this to get.  Do I keep it simple and ramble on about the various things that I see in this world, or do I dare to air my dirty biz for all to see.  It's not in me to drag people's names thru the dirt, but sometimes it makes for a good story-especially if there's a moral or something positive to be learned from it.  I guess I'm thinking about the possible backlash I would get from all the shit in my head that I need/want to get out.  And yes, I know that I started this blog so I made my bed in that respect, but it's just one of those things that I can't shake every time I get inspired to put fingers to keys and tell my side of things.

Also, I would have to ask for forgiveness when I write.  I have Twitter® and Facebook® and all of that, so the occasional rant or 15 is usually saved for that-but there are times when I just want to lay it all out there and I've often wanted to just put it all out there right here.  But I was wondering if that would be less entertaining and more a cry for help...or maybe just more fodder to convince the masses that I really do need help lol.

I know-randomness indeed.  But that's why we're here right?  Better out than in mama used to say.

Later kids
-Mr. DJ