so much, two pounds of chinese food and fried rice he posted it on twitter. we saw his photo, found its geo tag and within minutes pinpointed where he was, even though his tweet said nothing about his location. >> i didn't know how accurate it actually is. it's pretty startling to hear. geo tags are gps stamp that smart phones like the blackberry and iphone and photos taken by the device. >> it's usually latitude and longitude coordinates. >> lieutenant runs the crime squad, one of the biggest in the country. he says tracking geo tags can be used for any crime. from stocking to burglary. >> if you, for instance, take pictures of your new flat screen tv and you want to share with your friends, you may have given away your exact street address. then you may mention in another post you're going away on vacation on thursday. the next thing you know, someone knows where you live, that you're not home, and you have expensive property. >> we found out about them