this is how you should turn off your facebook instant personalisation in case you are worried about your privacy:
1. Log into Facebook. In the top right hand corner, click Account, and then Privacy Settings.
2. Under the heading Apps and websites, select Edit your settings.
3. Under the heading Instant personalization, select Edit settings. You may see a popup called ‘Understanding instant personalization’. Just hit Close.
4. At the very bottom of the page, simply untick the box labeledEnable instant personalization on partner websites. This will instantly turn off partner websites accessing your data.
If, however, the option is greyed out but still ticked, this means that Facebook has not yet activated instant personalization just yet. It takes time. Check back in a few hours, or the next day.