Scott Forstall showed Yelp on Apple’s new Maps app during the opening keynote at the Worldwide Developers Conference last week, but he neglected to mention Yelp check-ins

Those using iOS 6 probably noticed this feature in the Maps app when clicking a location.

According to Bloomberg, the Apple developer kit, which the Cupertino, Calif.-based Company distributed to software developers earlier this month, visually depicts how the upcoming Apple Maps essentially lets users alert friends of their location through Yelp without leaving maps or launching a new app.

Bloomberg added:

Mobile check-ins use the GPS capability in smartphones to let users share what local businesses or events they’re visiting. The feature can show how many other people have checked in at a location, whether those individuals are friends, and can publish users’ whereabouts through social-networking services such as those operated by Facebook and Twitter Inc.

Yelp is ramping efforts to attract local advertising, which made up 70 percent of revenue in 2011. Check-ins are used by 18 percent of adult smartphone owners, the Pew Research Center found earlier this year.

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