MacRumors reports that iOS8 features the app for nearby retailers showing up on your phone’s lock screen. For example, if you are in a Starbucks, the Starbucks app icon will appear on your lock screen:
“It appears that Apple will also suggest apps that are not installed when visiting certain locations. For example, a Twitter user who did not have the Costco app installed had a Costco app icon pop up when at local Costco, which took him to the App Store where he could download the app. “
If you are a business with a physical location that customers visit, be prepared to be hounded by app developers.