Basically any platform is going to have this sort of problem. If you have thousands of third-party developers, and users are willing to share data with them, so

Basically any platform is going to have this sort of problem. If you have thousands of third-party developers, and users are willing to share data with them, some of them are going to accidentally leak it. iOS, Android, Twitter, I guarantee all of those platforms will have at least two applications leaking data. This only gets to be news because it superficially sounds like Facebook is doing something bad again.