So how does it work?

How free do people get with these things? Any reprocussions? I'm thinking it will sooooo be typical for me to write something that lets me totally get something off of my chest, but then at the next family event an aunt or somebody says, "So, I was on the computer and saw your blog" that just happened to be all about them. Ooops. Has this happened to you? What did you do? What did you say?