It's called confidential postings which violate people's trust in you.
The idea is to post shit which deals with names and sensitive information regarding unflattering things about people and activities going on in your job and in your social life.
Oh, whoops, that's half the blogs out there.
I say this because I'll never do it but sometimes I'm tempted, as I'm sure most of you are.
Also called a Libel Generator 2000 blog. (Generates lawsuits faster than you can say slander!)