(Credit: Foursquare screenshot by Chris Matyszczyk/CNET )
They have a dominant need to become the mayor of their local laundromat and fishmonger.
However, others feel safer when others don't know where they are. Indeed, last night I saw several attendees of Oracle OpenWorld wandering around a part of San Francisco's North Beach and entering places from which I feel confident they would not have checked-in.
NASA's Mars rover, Curiosity, has no fears however.
It is unconcerned about broadcasting its precise whereabouts. It has no worries that by doing so it might be vulnerable to a Mars attack.