A growing number of brick-and-mortar businesses, eager to learn more about what goes on inside their walls, are turning to new technology to gather data from people's mobile phones.
Shopkick - News, Features, and Slideshows
Some 100 American Eagle clothing stores may not need greeters anymore: Soon they'll be saying a different kind of hello on your smartphone, advertising the latest deals.
Your smartphone can be a beacon telling the world where you are, with increasing precision. Is that good commerce or bad privacy, or maybe a bit of both?