Juli Clover, writing for MacRumors:

As of October, Foursquare has become one of the companies that contribute data to Apple’s Maps app, providing information on “Business listings data.” This likely includes details on restaurants, retail stores, and other venues, given Foursquare’s focus on unearthing the “best places to eat, drink, shop, or visit in any city in the world.”

This will undoubtedly improve Apple’s business listing data, which by all accounts, is still lagging behind Google’s offering.