File under "mixed blessing"...
Two new questions arise, courtesy of the latest advancement in cellphone technology: Do you want your friends, family, or colleagues to know where you are at any given time? And do you want to know where they are?
Obvious benefits come to mind. Parents can take advantage of the Global Positioning System chips embedded in many cellphones to track the whereabouts of their phone-toting children.
And for teenagers and 20-somethings, who are fond of sharing their comings and goings on the Internet, youth-oriented services like Loopt and Buddy Beacon are a natural next step.