<A target="_blank" href="http://www.cio.com/article/619642/6_Facebook_Twitter_Mistakes_That_Can_Get_You_Fired?source=rss_news&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+cio%2Farticles+%28CIO+-+Articles%29">Posting something on Facebook or Twitter isn't the same as saying it to your friends.</A> It isn't private, by any definition, and, once posted, whatever you said is almost impossible to retract.