When I blog, I usually use this as an outlet for whatever thoughts are spewing from my mind-- which means if I'm fawning over Gaspard, or angry about politics, I'll probably wright about it on here.
Some thought goes into my posts, and sometimes they're about abstract subjects. Sometimes it's just about how my day went, or a conversation with someone.
My point is, when you blog mean it. And if you're going to bad talk someone, make sure you'd actually say it to their face. You never know who could stumble upon your blog and use the things you type up as blackmail.
I make it a personal law to not write anything I don't mean. Yes, I may come off as stupid and ignorant for voicing my beliefs, but it's me, and my raw uncensored thoughts. ---However, I am trying to cut down on the bad language. I know, very cliche, but it bothers me when I type some cuss words, unless I'm angry.
Even though you think you're being careful, you have to watch out. Things like blogs may seem like harmless little popular accessories, but they're not. They are tools by which we communicate with the outside world. Make sure the messages you're sending out are genuine, and won't come back to bite you in the butt.