A tip I received from a retired Federal law person was to "Stay away from Facebook, Twitter and other mass methods of groups." How do you think this Muslim terrorist in Yemen was found? Another tip, don't ever steal a GM On-Star equipped vehicle. Even after the account to that instrument is closed it can be traced in moments. Enough said? Big brother is watching you a lot closer than you think.
A particularly helpful tip if you are doing anything untoward. If you are just doing your daily life taking little jimmy to soccer practice, can't see why big brother would give a rats ass.