You can get a squeak out of Apple so it was pretty interesting to see Foursquare claiming that it could mine its trove of foot traffic data around Apple stores to predict iPhone sales. Jeff Glueck's medium would suggest that they did indeed hit the nail on the head.
On Thursday, Foursquare released our first public predictions based on our global foot traffic data. We correlated foot traffic at Apple stores leading up to iPhone launches to the actual sales on launch weekends. We then found that this past week’s foot traffic seemed to indicate that sales of the new iPhone 6s and 6s Plus devices would be in the 13–15 million unit range. The official sales figures are in and Apple is reporting that they indeed sold “more than 13 million” new iPhones this past weekend — neatly fitting right within our prediction window.