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Applications not only take some of your data to make them function, but your friends' applications will also take some of your data, too. To prevent this, follow these steps.
1. Select the Edit settings button under the How people bring your info to apps they use heading.
You will see a list of all the check boxes for which data is already flowing out of your profile into your friends' applications. To remove these:
1. Uncheck as many boxes as you wish, to restrict these elements from being used by your friends' applications, then hit Save Changes.
Instant personalisation takes some of your data from Facebook and is added to third-party websites when you visit them. However, there has been a major privacy warning over the use of instant personalisation, and users are advised to disable this.
1. Click the Edit settings button next under the Instant personalisation heading.