Apple has cunningly devised a novel though controversial way of promoting its own iOS 7 stock apps, features and services right in the App Store search. The application store has seen a whopping 60 billion cumulative downloads thus far and with over a million apps carried it's serving a lot of customers on a daily basis.
If you now go to the App Store and run a search for popular generic terms such as 'browser,' 'movies' and 'SMS', the first entry popping up in your search results should be a banner advertising a related stock iOS 7 apps or feature like Safari, iTunes Store, Messages and more...