The US Supreme Court could soon allow police to monitor the movements of US mobile phone users without a warrant. Now that most of us carry sophisticated tracking devices in our pockets, how much privacy do we have a right to expect? Millions of us happily invade our own privacy every day on Twitter and Facebook, sharing personal details with the world and broadcasting our location in a way previous generations would have found bizarre. At the other end of the spectrum, in the world of smartphones, privacy is becoming an increasingly outdated concept, argues technology writer Sam Biddle. What might once have been considered "creepy" and invasive is becoming normal. "That line of creepiness is there, but it's eroding quickly because, frankly, we are just getting used to it," says Mr Biddle, a staff writer for Gizmodo.com. "It's a trade-off, in terms of privacy versus service," he says. For the mobile phone company "following you around is just part of the service". I am not sure how conscious anyone else may be on this subject, but I think we are getting used to the idea of being 'monitored' without any significant complains about it.