Do You Censor Yourself on Social Media?

Do others censor themselves on social media outlets such as Facebook, Twitter, LinkedIn, Blogs, etc.? The whole idea of Web 2.0 and social media is transparency - but does that mean that you should say and post whatever you want? Or because of the neverending/everlasting network that is the Internet, do we need to be even more careful about what we say and post?
http://socialmediatoday.com/SMC/79694