Apple has apparently started removing an increasing number of apps that allow users to search App Store contents and recommend apps to their friends. Apps that have been found to violate App Store regulation 2.25, which prohibits apps that could be confused as app stores, have been removed, and Apple seems to be broadening the scope of that rule. According to PocketGamer.biz:
Apple is apparently fiddling with the way in which it handles App Store searches. Previously, what an app was called and which keywords it used seemed to be the greatest influence in how it ranked. Now, how many downloads, and perhaps even what the app does might be what's getting ranked.
Apple has acquired Chomp, a search and discovery app for the iPhone that helps users find the best-of-the-best apps in the App Store. Apple plans to utilize Chomp's proprietary algorithms and technology to improve discoverability and user experience, presumably both on the mobile and desktop versions of the App Store.
FavorIt is the place where favorite friends and favorite apps meet. This new twist to app discovery lets you share your five favorite apps with your Facebook friends and view theirs. You can also see which apps are popular among all your friends.