People who blog and use social-networking and video sites such as MySpace, Facebook, YouTube, and other online sites are realizing <A HREF="http://www.cnn.com/2007/TECH/internet/01/01/self.editingonline.ap/index.html">just how public those spaces can be.</A> That realization, in turn, is causing many of them to reconsider what they post--or at the very least, to do more to protect their privacy.