Opinions on Talking Too Much

What do you all think about keeping things to yourself? Do you feel the need to censor what you say so that others can't use it against you? Do you wonder if someone will tell someone else that you may not want to know? I'm curious because I tend to speak fairly freely when I want to and don't feel I should have to curb what I say. However, it does cause issues sometimes. Perhaps I'll just block everyone from seeing my posts, blog posts and conversations so that only strangers can view my stuff. Then, what is the point in that?