Recent quotes:

Our guide explained that the horses, despite being extraordinarily intelligent beings, had a hard time making sense of seeing their friends appear out of nowhere, then disappear into the distance. Falling out of sight held the terror of being forever lost. My horse was calling out, making sure his friend was still there – that neither was lost. Underneath the geographic disorientation, one can imagine, lies a primal fear of losing control.
Foursquare already had a massive database of check-ins — location information about the places its users most liked to go. And this data didn’t just include the place where someone had checked in. It showed how strong the GPS signal was at the time, how strong each surrounding Wi-Fi hotspot signal was, what local cell towers were nearby, and so on. Leveraging this data meant that Foursquare could still grab a good current location even if users were underground, near a source of radio interference, or facing some other signal obstacle. Chances are, some prior Foursquare user had seen the world through the same flawed eyes and reported his or her location.