foursquare

Regardless of Yew Hong's explanation on Facebook, I remain unclear about the workings of foursquare (wireless or GPS?), which is capable of reporting the exact whereabouts of its members/users. As I mentioned, will there be a day when we see something like "Alan Tan (i.e. me) has just checked into Bukit Ho Swee public toilet cubicle #3"? :-O