I just watched Erasing David, a documentary about a man who tried to hide from two private detectives for a month.
Amazing; you just can’t hide unless you sacrifice pretty much everything.
And this was all relatively low-tech and with almost no access to the sort information a government can use (e.g. cellphone locations, passport registration at borders, ATM withdrawals, CCTV). Not to mention the stuff that’s coming in the next few years: mass facial recognition, CCTV online, everyone on Facebook, dirt cheap and ultra fast DNA sequencing, chip based public transport, better (international) interconnecting of databases, pattern/signature recognition in arbitrary (anonymous) data and accidental/ deliberate massive leaks from central databases. And last but not least: abundant cheap (online) labor to do all the work that can’t be automated.