Here the courts are struggling to determine what a "reasonable" expectation of privacy is, and the legislatures are working hard to define the rules of behavior. The process is almost more important than the content. Your safest rule of thumb is to presume that your on-line activity is not private. Too many times, the information flows through too many computers, each with the potential to duplicate, trace, or otherwise review what you're doing, for you to have a reasonable expectation of privacy. You aren't protected by probabilities when what you're doing is otherwise questionable. Also, if you're supposed to be at work, or are in a public place, you aren't really "private."