You have to explicitly grant location permissions for every app individually, plus the iPhone warns you if an app is using your location in the background, plus gives you the option to only give the app your location while it's open.
So exactly like with Facebook apps, where you also grant permission for every app individually and have granular control over which data if any at all can be shared?
The feature where your iPhone is notifying which app is using your location is a recent feature in iOS. Remember than the current criticism of Facebook is related to how Facebook was doing things years ago. So we should also compare with early versions of iOS to be fair.
