When you share information with your friends on Facebook, every app that your friends use can access and use that information. Read this post for further information.
Of course it’s better to think of all your data on Facebook as public, but still it’s hard to accept to share data with apps you can’t control.
There’s a way to stop this flow, though. Go to your Privacy Settings and follow this path:
Apps and websites : Edit settings
How people bring your info to apps they use : Edit settings
Here you can customize the information you share with other people’s apps. Other than that, you can just turn off all the apps:
If you don’t want apps and websites to access other categories of information (like your friend list, gender or info you’ve made public), you can turn off all Platform apps. But remember, you will not be able to use any games or apps yourself.