What determines your Facebook shortcuts?
Turns out, it's not a test - Facebook is actually showing each user a customized set of shortcuts on the function bar based on their individual activity. So if you use Marketplace a lot, you'll see a Marketplace tab, if you use Watch a lot – you get what I mean.
Why are apps different on iOS?
Apps made for the Apple App Store differ in various ways from apps made for the Google Play Store: Developers use different programming languages when developing for iOS versus developing for Android. iOS apps and Android apps require different budgets and maintenance tasks.