We use Facebook and Twitter for more than just talking with our virtual social communities these days. We use them to login to other sites, to comment, to register — to host our digital identity. That's why it's a good idea to check and control which iPhone and iPad apps have access to your Facebook and Twitter accounts. The best part is you don't even have to log in to Facebook or Twitter on the web. You can do it right from your iPhone or iPad!
Note: this method will only control what actual apps access your Twitter or Facebook accounts. This doesn't include web services and other kinds of non-iOS apps. So it's still a good idea to check the websites for Facebook and Twitter periodically for those things too.
How to track what iPhone and iPad apps are using your Twitter or Facebook accounts
Launch the Settings app on your iPhone or iPad.
Tap on Privacy.
Tap on Twitter or Facebook.
Toggle access On or Off for any of the apps listed.