Since its inception, Apple has promised they would collect data from varied sources to help develop its Maps application. Sticking to their word, Apple has added Foursquare to its “business listing data.” It’s almost been a month though since they’ve added Foursquare to its Acknowledgements page and so you’ve probably been unwittingly using Foursquare information when you use Apple’s Maps app. Some of the other sources for business listings include Booking.com, Trip Advisor, Yelp, and Yellow Pages. Hopefully the addition will help boost accuracy of the information further.
Source: Cult of Mac